A hydraulic crusher detachably attached to a distal section of an arm of a working machine, the hydraulic crusher comprising: a pair of crushing arms configured to grip and crush an object to be crushed; a crusher body, a proximal section of the crusher body attached to the distal section of the arm of the working machine, the proximal section of the crusher body having ports, a distal section of the crusher body supporting the crushing arms in an openable and closable manner around pivots, the crusher body having a hollow portion between the distal section and the proximal section of the crusher body, the hollow portion extending in a longitudinal direction defined by connecting the distal section with the proximal section of the crusher body; a pair of hydraulic cylinders, proximal sections of the hydraulic cylinders coupled to the proximal section of the crusher body outside the hollow portion rotatably around pivots, the proximal sections of the hydraulic cylinders having ports, distal sections of the hydraulic cylinders respectively coupled to the crushing arms rotatably around pivots; characterised in that the hydraulic crusher comprises: a plurality of first hydraulic hoses (7,17,27,37) having proximal caps connected to the ports at the proximal section of the crusher body, the first hydraulic hoses extending toward a distal side in the longitudinal direction in the hollow portion; a plurality of second hydraulic hoses (9,19,29,39) having proximal caps connected to the ports at the proximal sections of the hydraulic cylinders, the second hydraulic hoses extending into the hollow portion and then extending toward the distal side in the longitudinal direction while being curved; and joint means movable in the longitudinal direction in the hollow portion, the joint means connecting distal sections of the first hydraulic hoses with distal sections of the second hydraulic hoses. a pair of crushing arms configured to grip and crush an object to be crushed; a crusher body, a proximal section of the crusher body attached to the distal section of the arm of the working machine, the proximal section of the crusher body having ports, a distal section of the crusher body supporting the crushing arms in an openable and closable manner around pivots, the crusher body having a hollow portion between the distal section and the proximal section of the crusher body, the hollow portion extending in a longitudinal direction defined by connecting the distal section with the proximal section of the crusher body; a pair of hydraulic cylinders, proximal sections of the hydraulic cylinders coupled to the proximal section of the crusher body outside the hollow portion rotatably around pivots, the proximal sections of the hydraulic cylinders having ports, distal sections of the hydraulic cylinders respectively coupled to the crushing arms rotatably around pivots; characterised in that the hydraulic crusher comprises: a plurality of first hydraulic hoses (7,17,27,37) having proximal caps connected to the ports at the proximal section of the crusher body, the first hydraulic hoses extending toward a distal side in the longitudinal direction in the hollow portion; a plurality of second hydraulic hoses (9,19,29,39) having proximal caps connected to the ports at the proximal sections of the hydraulic cylinders, the second hydraulic hoses extending into the hollow portion and then extending toward the distal side in the longitudinal direction while being curved; and joint means movable in the longitudinal direction in the hollow portion, the joint means connecting distal sections of the first hydraulic hoses with distal sections of the second hydraulic hoses. a plurality of first hydraulic hoses (7,17,27,37) having proximal caps connected to the ports at the proximal section of the crusher body, the first hydraulic hoses extending toward a distal side in the longitudinal direction in the hollow portion; a plurality of second hydraulic hoses (9,19,29,39) having proximal caps connected to the ports at the proximal sections of the hydraulic cylinders, the second hydraulic hoses extending into the hollow portion and then extending toward the distal side in the longitudinal direction while being curved; and joint means movable in the longitudinal direction in the hollow portion, the joint means connecting distal sections of the first hydraulic hoses with distal sections of the second hydraulic hoses.