An operation element is disposed in a recess provided in a lower surface of a controller attached to a vehicle ceiling part, and the operation element comprises an inclined portion inclined at an upward gradient from a vehicle front toward a vehicle rear, a protruding portion formed by the inclined portion, and provided on a vehicle front side of a point, on the operation element, that has an equal distance from opposite ends of the operation element in a front-back direction, and an operating rotary shaft disposed on a side of the protruding portion.