To improve the structure of a loading part for always smoothly loading a jaw crusher with concrete masses with different sizes.

The jaw crusher comprises a fixed board 3 and a movable board 8 disposed in V-shaped arrangement in a lower part of a hopper 15 and a hydraulic cylinder 11 for supporting the movable board on a supporting point of a support shaft 9 in the lower end part so as to agitate the movable board, and the crusher crushes concrete masses 16 loaded by the hopper by agitation of the movable board. The top end face 18 of the movable board is formed in an arc-like face having the support shaft as the curvature center and a guiding plate 20 whose lower rim 21 slides on the top end face of the movable board is installed in the inner wall face of the hopper. The lower end rim 21 of the guiding plate 20 is slid on the top end face 18 of the movable board in the inner side than the tip part 22.