Abstract: A resolver can have a stator and a housing fixed without requiring a special jig. The resolver includes a housing in an approximately cylindrical shape, a stator core in an approximately annular shape fixed to the inside of the housing, in which an exciting coil and a detecting coil are wound therearound, and a rotor arranged on the inside of the stator core, wherein the stator core is fixed to the housing by a C-shaped ring, a groove extending in a circumferential direction is provided on the inside of the housing, and the stator core is fixed to the housing by engaging the C-shaped ring with the groove.