To provide a bearing for an electromagnetic clutch capable of preventing electrolytic corrosion caused by spark and failure of a rotary sensor.

This bearing 1 for the electromagnetic clutch constituted by a rolling bearing having a rolling body 23 between an inner ring 21 and an outer ring 22 has an insulation function. The insulation function is provided, for example, between the inner ring 21 and the outer ring 22. In this case, at least one of the inner ring 21, the outer ring 22, and the rolling body 23 is made of ceramics. This bearing 1 may have the rotary sensor 30.