To provide the vehicle which hardly changes the structure of a vehicle itself such as its carriage and the like, is safer as compared with a former one, is excellent in operating performance, and also can travel over either one of the difference in level and a stair case, or over both of them while a plain running condition is still being left over as it is.

A stationary caster 10 is mounted onto the forward end part of the back surface of a base plate 1 in a state that a wheel 9 is somewhat projected out of the forward end of the base plate 1, an universal caster 12 is mounted onto the rear end part of the back surface of the base plate 1, an intermediate wheel 13 is mounted onto the intermediate part of the back surface of the base plate in the longitudinal direction in a state that the wheel is somewhat floated from the ground plane, and a carriage 8 is so constituted that both an angle part 19 where a long side 16 and a short side 17 are formed roughly in an L shape, and a support arm 18 where auxiliary wheels 20 and 21 are rotatably mounted onto the tip ends of the long side 16, are mounted thereto in such a way as to be rotated around the tip end of the short side 17.