A front jaw for a safety binding comprising a lower part (3) of a housing, which lower part can be fastened to a ski, and an upper part (2) of a housing having at least one adjustable release spring (4) and two pivotal sole holders (14a, 14b) biassed by this release spring, with the upper part (2) of the housing being pivotal in the position of use of the front jaw about a transverse axis (Q) extending essentially normally with respect to the central longitudinal axis (L) of the front jaw, and the swivelling capability of the upper part of the housing relative to the lower part of the housing being limited by a locking piece (15, 115) having at least one stop surface (32a.sub.1, 32b.sub.1, 32a.sub.2, 32b.sub.2, 32a.sub.3, 32b.sub.3, 32a.sub.4, 32b.sub.4), which locking piece is supported horizontally movably in the lower part (3) or the upper part (2) of the housing, with this locking piece (15, 115), in the position of use of the ski binding, cooperating with a stop (29a, 29b) provided on the upper part or lower part of the housing, so that the swivelling movement of the upper part of the housing relative to the lower part of the housing is limited in this position.