To facilitate connection work, to improve the workability of assembly work or the like, to improve durability and to perform miniaturization.

A seat composed of a sitting seat and a backrest seat is rotatably attached to the fixing part of a car body or the like. In a device controlling the operation of the rotation operation lever of a rotation locking device fixing the seat in the respective directions of one side and the other side, a stopper release switch 11 detecting the operation of the rotation operation lever and a shift lock switch 12 are attached to an attaching pedestal 15 together with the switch connection line part 26 of a harness 25 connected to the stopper release switch 11 and the shift lock switch 12. The attaching pedestal 15 is fixed to a bracket 2 for attachment attached to the seat or the car body side.