To provide an arrangement structure that allows an operation switch knob to be confirmed at first before operating it by allowing conditions of operating the operation switch knobs to be indirectly seen even if the operation switch knobs is installed on the side of the seat.

A plural number of operation switch knobs allowing various types of functional equipment to be operated are provided on the side surface of a vehicle seat 10. The side surface of the vehicle seat and a compartment forming surface are arranged parallel to each other to be constructed. The operation switch knobs provided on the side surface of the vehicle seat are arranged in the positions that allows the occupant to perform switch operation while being seated. The compartment forming surface facing the side surface of the vehicle seat provided with the operation switch knobs is formed in the form of mirror surface on which the operation switch knobs are projected.