A fitting system (9) is provided for a vehicle seat (1), especially motor vehicle seat, which defines a pivot axis (A) of backrest and has a fitting lower part (11) and an associated fitting upper part (12) on both sides of the vehicle seat. Each fitting upper part (12) is pivotable relative to the associated fitting lower part (11) about the pivot axis (A) of the backrest. The system has, on one side of the vehicle seat, a lock (15) and an opposing element (16), which lock the fitting system (9) in a use position by cooperating. A prestressed latch (17), which cooperates with another opposing element (16), especially receives it, in the use position, is provided on the side of the vehicle seat that is located opposite the lock (15).