To provide a self-propelled crusher which enables a stable overload-protection of a jaw crusher for a long period, and its overload-protection arrangement.

The crusher has a crusher frame 61, a fixed tooth 71 fixed to the crusher frame 61, a moving tooth 72 slidably supported by the crusher frame 61, a supporting member 64 fixed at a front side of the moving tooth 72 in the crusher frame 61, a braking plate 67 and a sliding member 66 provided so as to enable a sliding in a predetermined direction within a space formed by the supporting member 64, a braking piston 69 giving a pressure via a friction plate 68 from a direction perpendicular to the sliding direction of the braking plate 67 so as to hold the braking plate 67, a toggle plate 70 held between the sliding member 66 and a lower end of the moving tooth 72, and a hydraulic cylinder 75 biasing to a direction where the moving tooth 72 and the supporting member 64 come close.