A seat adjustment apparatus for a vehicle includes a first bracket, a second bracket defining an accommodating void with the first bracket, a pawl, and a pawl reverse spring, The pawl includes a ratchet portion, a pawl side reverse wall portion, and a pawl side return wall portion, the ratchet portion allowing a relative rotation of the first and second brackets in a first direction and prohibiting a relative rotation of the first and second brackets in a second direction in a case where the pawl is biased to rotate in a normal direction, the pawl side reverse wall portion allowing the relative rotation in the second direction so that the pawl is reversed by being biased to rotate in a reverse direction, the pawl side return wall portion bringing the pawl to be returned by being biased to rotate in the normal direction.