To provide a truck capable of stably transferring curve advancing to straight advancing without using a complicated structure.

Axles 7 arranged on a lower side of a deck 3 are connected to rotary shafts 13 provided in the vicinity of a front end part and the vicinity of a rear end part of the deck 3 to be rotatable in relation to the deck 3. Wheels 5 for traveling and wheels 9 for receiving load arranged between the deck 3 and the wheels 5 for traveling are integrated to the axle 7. Wheel receivers 11 provided with inclination so that center parts 27 may be recessed on surfaces opposed to the wheels 9 are fixed to a lower surface of the deck 3. During the curve advancing, the axles 7 form prescribed angles with the deck 3, while the wheels 9 are moved to positions deviated from the center parts 27 of the wheel receivers 11. The deck 3 is raised up, and the rotary shafts 13 are elongated and contracted according to vertical movement of the deck 3. When the curve traveling is transferred to the straight advancing, the wheels 9 are returned to the center parts 27 along the inclination of the wheel receivers 11 by load of the deck 3, and the axles 7 become perpendicular to an advancing direction.