LOCKING DEVICE FOR VEHICLE SEAT

A locking device for a vehicle seat including: a striker and a lock mechanism including: a base plate; a hook supported rotatably by a hook shaft to the base plate and capable of forming a locked state and an unlocked state; a pawl supported rotatably by a pawl shaft to the base plate; and a cam supported rotatably by the pawl shaft to the base plate, and the cam is rotationally biased by a first torsion coil spring, and the pawl is rotationally biased by a second torsion coil spring, and the coil of the second torsion coil spring has a larger diameter and a smaller length in a central axis direction of the coil than the coil of the first torsion coil spring, and one end of the first torsion coil spring is provided on a radially outer side than the coil of the second torsion coil spring.