an induction heating unit enabling to attaching coil on coil attaching surface of bobbin with a high degree of accuracy , and a fixing device capable of maintaining the distance between the coil and the member to be heated at a high degree of accuracy , ensuring uniformity of temperature distribution of the member to be heated , rising temperature at a high speed , and enhancing quality of fixation . in an induction heating unit 30 including a magnetizing coil 39 attached on a coil bobbin 38 which is disposed outside of annular body 19 to be heated , the unit including : a layer of elastic adhesive 44 a provided on the outer surface of the coil bobbin 38 ; a magnetizing coil 39 provided on the layer of elastic adhesive 44 a , the magnetizing coil 39 being wound beforehand following an attaching surface ; and a layer of elastic adhesive 44 b provided on the magnetizing coil 39 .