A parking brake apparatus includes: a braking member; a ratchet having a plurality of serrations and disposed on one of the braking member and a vehicle body-side member; a pawl rotatably disposed via a pawl pin on the other; and a pawl-urging spring. At start of braking, every time the pawl relatively climbs over the serration, the pawl is brought into contact with a non-locking surface side of the serration in accordance with an urging force of the pawl-urging spring. The pawl has a triangular engagement tooth that is inserted into a tooth groove of the ratchet, and a second side end surface facing the non-locking surface is covered with a synthetic resin except a tip portion of the engagement tooth. The non-locking surface is a concave surface concaved so as to be recessed from a straight line connecting a tooth tip and a tooth bottom of the serration.