To prevent the occurrence of bite of a tip of a bridge for connecting a carrying base and the ground into the ground.

This device is horizontally moved in the force and aft direction along rails 21 provided from a front end on a chassis to a lower part of a rear end of the chassis through a rear end on the chassis of a vehicle carrying vehicle. Furthermore a load carrying platform 20 to be moved in the vertical direction for elevation till a front end of a load carrying platform 20 contacts with the earth E while maintaining the horizontal condition after arriving the rear end of the chassis and a telescopic arm unit, of which the base end is fitted to the rear end of the chassis freely to be turned and of which the tip abuts on a lower surface of the load carrying platform 20 in rear of the chassis so as to support the horizontal movement of the load carrying platform 20 in the fore and aft direction from under and which moves the load carrying platform 20 in the vertical direction for elevation, are provided.