A steering lock driving circuit includes: a microcomputer (30) that, based on a detected condition of a vehicle, outputs one of a lock command for restricting rotation of a steering shaft (25) by a rock member (21) to carry out steering lock and an unlock command for releasing the steering lock; a latch circuit (311) that, when an unlock signal indicating that the lock member (21) is located in an unlock position is input to the latch circuit (311), holds the unlock signal; an OR circuit (313) to which a logical NOT signal of a signal output from the latch circuit (311) and a parking signal indicating that a shift position is a parking position are input; and an AND circuit (314) to which one of the lock command and the unlock command, a signal output from the OR circuit (313) and a condition coincidence signal generated when information detected from the vehicle satisfies a predetermined condition are input.