according to a timepiece in one embodiment of the present invention , as shown by a disassembled view in fig1 , a module 20 is fixed to a case 10 by fitting the fitting projected portions 23 b formed at a side face of a housing made of a resin constituting a portion of the module 20 to a plurality of engaging recessed portions 11 b formed at an inner side face 11 of the case 10 having one - piece structure integrated with a case band and a case back . the housing is preferably made of resin and comprises a first housing 23 and a second housing 24 for containing or attaching constituent parts of the module 20 . in fig1 , the fitting projected portions are provided at a portion of an elastically deformed portion 23 a in a shape of a two - sided supporting beam formed integrally with the first housing 23 and being deformable in a planar direction . that is , as shown by the disassembled view in fig1 , and in a plane view in fig2 , a sectional view cut in a strap length direction in fig3 and a partial sectional view in fig4 , respectively , the timepiece according to the presently described embodiment of the invention is constructed with the case 10 integrated with the case band and the case back and having an only opening portion 11 c on a surface side , the module 20 having the first housing 23 made of resin and contained in the case 10 and cover glass 12 for covering the opening portion 11 c of the case . since the case 10 is the case having the one - piece structure integrated with the case band and the case back , a containing portion thereof for containing and fixing the module 20 is a one - bag - like containing portion . according to the timepiece of the embodiment of the invention , the one - bag - like containing portion is a cylindrical containing portion having the substantially rectangular opening portion 11 c with four corners thereof in a circular arc shape . a plurality of the engaging recessed portions 11 b are formed at an inner side face of the one - bag - like containing portion , that is , the inner side face 11 of the case 10 . according to the timepiece of the embodiment of the invention , the plurality of engaging recessed portion 11 b are formed by four pieces respectively at the four corners of the inner side face 11 of the case 10 . according to the timepiece of the embodiment of the invention , the module 20 is constituted by a circuit block 21 , a liquid crystal display element 22 , the first housing 23 and the second housing 24 . the circuit block 21 is constituted by mounting various electronic parts constituting an electronic timepiece on a circuit board . the circuit block 21 held between a lower face of the first housing 23 and an upper face of the second housing 24 made of resin and the liquid crystal display element 22 electrically connected to the circuit block 21 is held on an upper face of the first housing 23 . a planar shape of the module 20 successively laminated and integrated with the liquid crystal display element 22 , the first housing 23 , the circuit block 21 and the second housing constitutes the substantially rectangular module with the four corners in the circular arc shape . the side face of the first housing 23 is provided with a plurality of the elastically deformable portions 23 a in the shape of the two - sided supporting beam deformable in the planar direction . in the timepiece of the presently described embodiment of the invention , four of the elastically deformable portions 23 a of the two - sided supporting beam are provided and are integrally formed with the housing by providing through holes 23 c in a crescent shape at each of the four corners of the first housing 23 . the fitting projected portion 23 b is formed at a portion of the elastically deformable portion 23 a of the two - sided supporting beam . the fitting projected portion 23 b is a projection in a tapered shape or a projection in a shape of an inverse cone spreading or opening in the direction of a side of the cover glass 12 , that is , the side of the opening portion 11 c . by having such a shape , when the module 20 is integrated to the containing portion of the case 10 , only an apex of a circular arc of the fitting projected portion 23 b is brought into contact with the inner side face 11 of the case 10 and therefore , when the module is contained , the elastically deformed portion 23 a is smoothly deformed and integrating performance is promoted . a face of the fitting projected portion 23 b on a side of the cover glass 12 is provided with a removing recess 23 b . there is a case of removing the module 20 temporarily contained in the case 10 from the case 10 depending on a situation of fabricating steps . at that occasion , the elastically deformed portion 23 a in the shape of the two ends supporting beam is planarly deformed by touching a front end of an engagement releasing jig of a tweezers or the like to the removing recess 23 ba to thereby release the fitting between the fitting projected portion 23 b and the engaging recessed portion 11 b . a procedure of containing and stably fixing the module 20 to the case 10 will be explained as follows . according to the embodiment of the invention , the module 20 is constituted by holding the circuit block 21 shown by the disassembled view in fig1 between the first housing 23 and the second housing 24 made of resin and integrating the liquid crystal display element 22 to the circuit block 21 . when the module 20 is moved down to integrate the module 20 constituted in this way from the side of the cover glass 12 into the case 10 , the highest position of the inner side face 11 of the case and the fitting projected portion 23 b provided at the first housing 23 made of resin are brought into contact with each other . when a pressing force is further exerted on the module 20 , the fitting projected portion 23 b in the tapered shape spreading toward the outside of the cover glass 12 has a planar force planarly directed imposed thereon toward the center of the case to thereby planarly deform the elastically deformed portion 23 a of the two - sided supporting beam formed at the first housing made of resin . then an amount of protrusion of the fitting projected portion 23 b formed at the portion of the elastically deformed portion 23 a in the shape of the two - sided supporting beam from an outer periphery of the module 20 is reduced . by continuing to press further , the module 20 sinks to a side opposed to the cover glass 12 and , at the same time , the fitting projected portion 23 b moves toward the center of the case 10 . when an outermost periphery of the fitting projected portion 23 b coincides with the inner side face 11 of the case 10 , planar deformation of the elastically deformed portion 23 a of the two - sided supporting beam is stopped and the first housing 23 is moved along the inner side face 11 of the case . when a predetermined sectional moving amount is reached , the fitting projected portion 23 b reaches the engaging recessed portion 11 b provided at the inner side face 11 of the case , the elastically deformed portion 23 a returns to the original shape by the elasticity and also the fitting projected portion 23 b is settled to a position on an outer side of the outer periphery of the module 20 . as described above , when the module 20 is integrated to the containing portion of the case 10 , the elastically deformed portion 23 a in the shape of the two - sided supporting beam is planarly deformed in the direction of the center of the case 10 since the fitting projected portion 23 b is pressed by the inner side face 11 of the case 10 . since the elastically deformed portion 23 a has the two - sided supporting beam , a deformation amount thereof can be made larger than that of the conventional fitting projection having the cantilever structure . this means that a fitting amount when elastic deformation is released and the fitting projected portion and the engaging recessed portion are fitted to each other is increased . therefore , when the module 20 is integrated to the containing portion of the case 10 , it is extremely easy to deform the elastically deformed portion 23 a such that an outer peripheral face of the module 20 and the apex of the fitting projected portion 23 b coincides with each other . further , when the elastically deformed portion 23 a in the shape of the two - sided supporting beam formed in this way returns to the original shape when the fitting projected portion 23 b is fitted to the engaging recessed portion 11 b . thereby , the module 20 is contained and stably fixed to the containing portion of the case 10 having the one - piece structure integrated with the case band and the case back . meanwhile , as is apparent from the plane view of fig2 , according to the invention , the module 20 is stably fixed to the case 10 having the one - piece structure and the thickness between the inner side face and the outer side face of the case 10 is thinner than that of the conventional timepiece of this type . this is because the module fixing structure according to the invention is constituted by the plurality of engaging recessed portions 11 b formed at the inner side face 11 of the case 10 and the fitting projected portions formed at the outer periphery of the housing 23 made of resin of the module 20 which are the fitting projected portions 23 b formed at portions of the elastically deformed portions 23 a in the shape of the two - sided supporting beam formed integrally with the outer periphery of the housing 23 made of resin . in this way , the amount of projection from the housing made of resin to the outer periphery is constituted only by the amount that the fitting projection 23 b projects so as to be fitted to the engaging recessed portion 11 b provided at the inner side face of the case 10 . therefore , special means for concealing a total of the hook portion constituting the fitting portion , for example , concealing the outer periphery of the module by a dial or a bezel which has been needed in the conventional timepiece of this kind , is dispensed with . incidentally , according to the plane view of fig2 , the concealment of the fitting portion is realized by making an outer peripheral face of a display face 12 a of the cover glass 12 opaque , however , the opaque portion is much smaller than that in the conventional timepiece . in this way , according to the invention , the module 20 can be contained and stably fixed to the containing portion of the case 10 without covering the outer periphery of the module 20 . further , in fig1 and fig2 , there is provided the module fixing structure having four sets of portions of fitting the engaging recessed portion 11 b and the fitting projected portions 23 b , however , a module fixing structure having three sets of the fitting positions can be constituted . further , the module fixing structure can also be realized by two sets of the fitting portions by constituting a structure in which the module 20 is not inclined to the case 10 . the module fixing structure achieving the inclination preventing operation is a structure in which , for example , two sets of the portions of fitting the engaging recessed portions 11 b and the fitting projected portions 23 b are provided at positions symmetrical with each other relative to a center point of the case and a fitting area thereof is extended in a circumferential direction . further , the module 20 includes not only an electronic timepiece module having a liquid crystal display element but also a movement of a mechanical timepiece or an electromechanical timepiece . the invention can provide a module fixing structure which is a module fixing structure for solidly and stably fixing a module to a case in a timepiece integrating and fixing the module from an opening portion for containing the module on a side of cover glass in the case having a one - piece structure integrated with a case band and a case back and a module fixing structure making a thickness between an inner side face and an outer side face of the case considerably thinner than that of the conventional timepiece of this type . therefore , in the case of a timepiece having a display face the same as that of a conventional timepiece of this type , small - sized formation of the case and small - sized formation of the timepiece can be realized . further , in the case of a timepiece having a case of a size the same as that of a conventional timepiece of this type , large - sized formation of a display face can be realized . according to a module fixing structure of the invention , a module is fixed to a case by fitting the fitting projected portions formed at portions of elastically deformed portions in a shape of a two ends supporting beam integrally formed at a side face of the housing made of resin for holding the module and deformed in a planar direction to a plurality of engaging recessed portions formed at an inner side face of the case having a one - piece structure integrated with a case band and a case back . therefore , fabrication cost of the housing is considerably reduced in comparison with that of a conventional module fixing structure having an elastically deformed portion in a cantilever shape of this type . further , since the elastically deformed portion formed with the fitting projected portion at a portion thereof is an elastically deformed portion in a shape of a two ends supporting beam type deformed in a planar direction , in comparison with an elastically deformed portion in the cantilever shape adopted in a conventional module fixing structure of this type , a stable fitting projected portion which is difficult to the deformed plastically can be realized . further , an amount of deforming the elastically deformed portion becomes larger than that of the elastically deformed portion in the cantilever shape adopted in the conventional module fixing structure of this type and therefore , integration or removal of the module is carried out more smoothly .