A movable contact board is engaged to a detent plate and the movable contact board is provided with a plurality of support portions, for example, four legs for supporting a stationary contact board and, on the other hand, the stationary contact board is provided with a plurality of guide grooves for reciprocally guiding the four support portions (legs) in the movable contact board along the rotational direction. Further, the plurality of the support portions (leg) are configured of the support portions, for example, four legs extending generally vertically from the movable contact board so as to straddle stationary contact points and bending portions provided in the four respective legs to penetrate through the pair of the guide grooves in the stationary contact board for supporting the stationary contact board from the backside. Thereby, an inhibitor switch preferable in view of reduction in the number of components and reduction in a plastic amount can be provided.