A connection state (conduction/non-conduction) between a slide electrode and a first electrode pattern is switched with a first rotation angle as a boundary, and the switching of the connection state is generated by switching a contact state (contact/non-contact) between a first contact and a first electrode pattern. A connection state between a slide electrode and a second electrode pattern is switched with a third rotation angle as a boundary, and the switching of the connection state is generated by switching a contact state between a first contact and a second electrode pattern. That is, the contact state between the first contact farther away from a rotation center than the second contact and the electrode pattern defines a connection state between the slide electrode and an electrode pattern.