SEAT LOCK DEVICE

A seat lock device includes: a striker installed in a vehicle body; and a lock unit provided on a seat back tiltable in a seat front-rear direction and holding the seat back in a standing state by locking the striker. The striker includes a base bracket attached to the vehicle body and a U-shaped rod locked by the lock unit, the base bracket has two support portions which respectively support end portions of the rod with a space therebetween in the seat front-rear direction, and at least one of the support portions deforms when a load exceeding a predetermined load is input to the rod so as to permit movement of the end portion of the rod supported by the support portion with respect to the base bracket.