VEHICLE SEATBACK LOCKING DEVICE

A vehicle seatback locking device is configured to lock a striker using an upper latch and a lower latch, to lock, using a cam, the lower latch configured to lock the striker, and to prevent the lower latch from being rotated by external force in the unlocking direction. The locking device makes it possible not only to prevent the striker from being unlocked from the lower latch, but also to prevent unexpected movement of a seatback due to unlocking between the striker and the lower latch.