A seat reclining apparatus for a vehicle, includes a first arm, a second arm rotatably supported by the first arm, a pawl including external teeth engageable with internal teeth, a cam portion and plural pawl-side cam surfaces arranged at the cam portion, a cam including a cam surface engaging with the cam portion formed at the pawl, and a biasing member biasing the cam to rotate and causing the cam surface to press the cam portion in a radial direction. The plural pawl-side cam surfaces or the cam surface is configured in a manner that the plural pawl-side cam surfaces and the cam surface are in contact with each other when the external teeth and the internal teeth are in an engaged state and in a manner that clearances generated between each of the plural pawl-side cam surfaces and the cam surface in the radial direction are all uniform.