To improve the traveling and turning performance of a crawler by realizing constant theoretical turning radius.

This crawler vehicle provided with a continuously variable transmission mechanism for straight-ahead 25 to drive the crawler 2, a continuously variable transmission mechanism for swiveling 28 to drive the crawler 2, and a gear mechanism 35 for transmitting each of the driving force for straight-ahead and turning motions to left and right crawlers 2, is further provided with a straight-ahead operating mechanism 124 for connecting a straight- ahead gear change lever 73 to the continuously variable transmission mechanism for straight-ahead 25, and a turning operation mechanism 118 for connecting a steering handle 19 to the continuously variable transmission mechanism for turning 28 to keep a ratio of the controlled variable of the continuously variable transmission mechanism for straight-ahead 25 and that of the continuously variable transmission mechanism for turning 28 approximately constant even when a car speed is changed under a condition that an operating position of the steering handle 19 is approximately fixed.