Patent ID: 7956298

Claim:
An inhibitor switch for an automatic transmission comprising: an insulative, plastic stationary contact board; a metallic detent plate rotating with a shaft depending on a select position of an automatic transmission, wherein the stationary contact board and the detent plate are arranged to be opposed to each other, and the stationary contact board is provided with metallic stationary contact points; and an insulative, plastic movable contact board engaged to the detent plate, wherein the movable contact board is provided with metallic movable contact points at positions facing the stationary contact points to slide on the stationary contact points, and by detecting a change of an electrical connection pattern in accordance with a sliding position of the movable contact point to the stationary contact point when the detent plate rotates with rotation of the shaft, a shift range position for the automatic transmission is detected, wherein: the movable contact board is provided with a plurality of support portions for supporting the stationary contact board; and the stationary contact board is provided with a plurality of guide grooves for reciprocally guiding the plurality of the support portions in the movable contact board along the rotational direction.