An electromagnetic clutch can be manufactured with reduced steps and cost. In the electromagnetic clutch, an electromagnetic coil unit 4 for causing a rotor and an armature to magnetically adhere to each other to enable power transmission from a drive source to a driven device includes: a bobbin 42 around which an electromagnetic coil 41 is wound; a power supply connector 43 attached to a connector mounting portion 424 formed in the bobbin 42, to supply external power to the electromagnetic coil 41; and a field core 44 in which a through hole 443a is formed. In the field core 44, a proximal part of the power supply connector 43 and the bobbin 42 are stored in a storage portion in a state where a distal part of the power supply connector 43 is exposed to outside from the through hole 443a, and the storage portion is filled with resin.