To solve problems in an amphibian car forming the crawler of a crawler device as a buoyancy body wherein a crawler is required to produce lightly, strongly and inexpensively for practical use, manufacturing the crawler by the foaming resin is difficult for a strong fixation only by adhesion of a foaming resin and a belt to complicate a crawler structure for requiring separate reinforcement and increase a cost due to an increase in a manufacturing process by complication, and to increase a manufacturing cost due to being indispensable in welding when manufactured by aluminum.

The crawler of the crawler device is formed as a structure of connecting an end part by a pin, and the lightweight, strong and inexpensive crawler can be formed by connecting a hollow resin block manufactured by using a metal mold.