A seat reclining device for a vehicle, wherein play in the seat reclining device is suppressed by eliminating gaps between pawls and a guide wall. A wedge member (73) is provided between a guide wall (51) and at least one of pawls (31). A cam (32) is provided with a wedge pressing cam section (55c) for radially outwardly pressing the wedge member to cause an upper arm (12) to rotate relative to alower arm (11). The wedge member is, for example, a spherical member or a wedge-shaped plate-like member.