the objective of the present invention is to provide a reciprocation switching device for a pump which will solve problems of conventional devices such as that , because coil springs are used for activating by their snap action valve operators or switching operators serving to control the pressure of pump working fluid in relation to reciprocating action of the pump , such devices require the numerous number of parts including spring fitting shafts , the structure to attach such fitting shafts , parts for spring holders , etc . ; and that the assembling of those parts is troublesome . a device according to the present invention uses one or two wire springs made into a c - like shape as the springs for the aforementioned purpose and calls for fitting said springs directly between the spring fitting section and the valve operator or the switching operator .