PURPOSE: To surely and rapidly load/unload the cargo with little swinging in the right-to-left direction while the cargo is moved on a load-carrying platform by providing supporting rolls at several points on a guide rail, placing floor members on the upper surface of supporting frames where side members and cross members are provided to form the load-carrying platform, and moving the cargo on the supporting rolls by a slide cylinder provided on the rear of the frames.

CONSTITUTION: A guide rail 6 is provided on a frame 3 and is embedded so that the outer circumferences of supporting rolls 9 may be approximately projected above the upper surface of the guide rail 6 by supporting shafts 10 provided at several points on the guide rail 6. Cross members 16 are provided at several points between side members 14, and floor members 15 are provided on the supporting frames 13 for a trapezoidal load-carrying platform consisting of these outer frames 17a, 17b to realize the slidable supporting on the supporting rolls 9. A slide cylinder 22 is connected to a compressor 4 by pipings to allow the free linkage of the supporting frames 13 by the movement of a piston shaft 22b. When the load-carrying platform 30 is appropriately tilted, the supporting frames 13 are moved on the supporting rolls 9 by the slide cylinder 22 to push the cargo out of the frame 3.