The invention relates to a device for adjustment of the backrest inclination for a backrest (1) of a seat, in particular in a motor vehicle, whereby the backrest (1) is connected to a rotating locking device (2). Said device may be locked in defined lock positions (3, 4, 5, 6) for adjustment of the inclination, by means of a locking element (7) which may be positionally adjusted, whereby the locking element (7) may be placed in a defined spatial position, by means of at least one operating mechanism (10, 11, 12, 13), such that it is in a position to be locked in only a partial number of the possible locking positions (claim 1). A defined adjustment of the inclination is thus achievable in a simple manner.