To prevent a hydraulic hose from breakage by taking the constitution of a hydraulic cylinder of an outrigger into consideration and preclude damage of a rod part by taking the arranging method of the hydraulic cylinder into consideration.

The outrigger device is configured so that outriggers 10 are installed on both sides of a machine body swingably up and down and the hydraulic cylinder 40 is installed between each outrigger 10 and the machine body in such a way as capable of elevating and sinking, wherein oil passages 54a and 54b are formed inside the rod part 40b of the cylinder 40, and the coupling parts of the supply and exhaust parts of the oil passages 54a and 54b with hydraulic hoses 51a and 51b are located near the turning fulcrum of the hydraulic cylinder 40.