To provide a crawler that can suppress running costs by extending a service life of a bush meshed with a driving wheel (sprocket) of a crawler vehicle and that can be used under a high load condition and applicable to all devices ranging from small devices to large ones.

In this crawler 1 of a crawler vehicle having a track chain 2 with a plurality of track links 5 each having a pin 9 connecting a pair of links 7 and 8 spaced away from each other in the horizontal direction connected to each other via the pin 9, a driving wheel (sprocket) 40 and a bush 11 meshing with the driving wheel 40 are rotatably mounted to the pin 9, and a beam 12 for connecting the pair of links 7 and 8 is provided at the center between the adjacent pins 9.