POWER TRANSMISSION DEVICE

This power transmission device is provided with an electromagnet (12), a rotor (11), an armature (14), and a hub (15, 15A) that links the armature to a shaft of a device to be driven. The hub is configured to include an outer hub (16, 16A) linked to the armature, an inner hub (17, 17A) linked to the shaft, and an elastic member (18) interposed between the outer hub and the inner hub. A plurality of extending parts (171, 171A) extending radially outward from the shaft are provided to the outer peripheral side of the inner hub. An inner peripheral side wall (162, 162A) that overlaps the plurality of extending parts in the shaft rotational direction and encloses the plurality of extending parts is provided to the inner peripheral side of the outer hub. The elastic member is disposed between the outer peripheral side of the inner hub and the inner peripheral side of the outer hub, in a state of being not bonded to at least one of the inner hub and the outer hub. 动力传递装置具备电磁铁(12)、转子(11)、电枢(14)、以及将电枢与驱动对象装置的轴连结的轮毂(1