To provide a switching device capable of avoiding giving the sense of discomfort at slide operation even when warpage occurs in a housing.

In an LED lamp, a plurality of V-notches 46a capable of giving click feeling are formed in the direction in which a flat plate 46 of an operation knob 43 expands. Therefore, even when a frame 20 is warped to the slide direction of the operation knob 43 and a space Sp between the flat plate 46 of the operation knob 43 and an inner wall of the frame 20 becomes narrow, the narrowed space Sp does not affect a concavo-convex part which gives clicking feeling and is formed in the direction in which the flat plate 46 expands, not in the direction of the thickness of the flat plate 46. Thus, even when the frame 20 is warped, no sense of discomfort occurs in slide operation by having a clicking mechanism structured with the plurality of V-notches 46a formed in the direction to which the flat plate 46 expands and a triangle projection 26, to be engaged with the plurality of V-notches 46a, of the frame 20.