To provide a rotary electrical which is compact and thin.

The rotary electrical part includes a rotary body 6 having a groove 6b provided for engaging a screwdriver, and a support member 5 for supporting the rotation of the rotary body 6, in a state in which the member 5 is brought into contact with a lower part of the rotary body 6. Since the groove 6b is formed at a depth for positioning the member 5 or deeper than the position of the member 5, a thickness of the rotary body 6 can be made thin, and the thin type rotary electrical part can be provided.