To improve stability of a crawler crane during working and running.

In the crawler crane 1 structure, a crane 4 which has a boom device 8 derricked by a derrick cylinder device 6 is mounted on a body 3 capable of running by right and left crawlers 2, and a pair of right and left outrigger devices 5RF, 5RG or the like which can rotate horizontally are arranged in the front and the rear of the body 3 respectively. At this time, the derricking cylinder device 6 in the crane 1 is arranged under the boom device 8, and the front outrigger device 5RF, the rear outrigger device 5RB and the like are arranged on the body 3 such that positions of their rotational center are each other deflected from side to side and they are stored in parallel longitudinally.