A shift sensor includes a movable member, four movable contacts, seven fixed contacts, and two power supply terminals. Each of the movable contacts is fixed to the movable member and pivoted to a position corresponding to a shift position. Each of the fixed contacts outputs a shift signal when it is brought into conduction with a power supply terminal by coming into contact with any of the movable contacts. The fixed contacts are arranged such that the number of shift signals that differ between shift positions is three or more, between the shift positions of P, R, N, D, and B, except for between the D and B positions.