An inhibitor switch for detecting a shift position of a select lever is provided with: a terminal block fixed in a transmission case of an automatic transmission; a contact plate provided in the terminal block; an operating portion configured to cooperatively move with the select lever and to move along the contact plate; a movable contact formed on the operating portion and configured to slide on the contact plate to form an electric circuit according to a contact position between the contact plate and the movable contact; at least one disconnecting portion formed in the contact plate and cut at a plurality of positions after the contact plate is provided in the terminal block for interrupting electrical conduction; and at least one set of a plurality of disconnecting holes for cutting the disconnecting portion and formed in the terminal block by primary molding. The disconnecting holes respectively correspond to the plurality of positions at which the disconnecting portion is cut. The plurality of disconnecting holes are sealed by secondary molding after the disconnecting portion is cut.