A lock device for a vehicle includes a base plate provided with an entrance/retracting groove for receiving or retracting a striker and a latch pivotally supported on the base plate by a latch axis. The latch includes a lock groove engaging with or disengaging from the striker entering the entrance/retracting groove and rotatable between a lock release position allowing the striker entering into the entrance/retracting groove and a lock position for holding the striker in the entrance/retracting groove by the movement of the striker. A first biasing member is provided for biasing the latch in the rotational direction to the release position to bias the pawl in a rotational direction towards the release preventing position and a second biasing member is provided for biasing the rotation plate in a rotational direction towards the release position of the latch.