To provide such a door locking device with a driving member reciprocally moved with the normal rotation of a motor to make a locking mechanism from a half-locking condition into a full-locking condition as being capable of preventing a driving member from unlocking interference when the driving member is stopped on the way of forwarding because of the entry of foreign matters, improving its convenience and reducing its cost.

In a locking device, a driving member is reciprocally moved between an initial position and a locking-finish position with one rotation of a rotation member to make a locking member from a half-locking condition into a full-locking condition. It has a reversing relay switch 13 to reverse a motor and a charging circuit 4 to operate the reversing relay switch 13 with electric charge for reversing the motor 3 when a position detecting switch 22 is not normally operated with charge while the motor 3 is normally rotated. When a thrusting lever is stopped on the way of forwarding, the thrusting lever is returned to an initial position with the reverse rotation of the motor 3 to avoid unlocking interference.