Abstract: The present invention is provided with: a guide frame (22) provided so as to be rotatable about a rotation axis (23) perpendicular to the floor surface of a vehicle body; guide wheels (30) which are arranged in the front rear direction of the guide frame (22) and which are in order to be able to grip a center guide rail (90) aligned in the width direction of the vehicle so as to form gripping pairs; equalizing links (40) each supporting two guide wheels (30) which are adjacent to each other in the front rear direction so that each of the two guide wheels (30) can rotate about a rolling axis (31) parallel to the rotation axis (23) each of the equalizing links (40) connecting the two guide wheels (30) as a connected pair and being mounted to the guide frame (22) so as to be rotatable about a link axis (41) parallel to the rotation axis (23) ; and a steering link mechanism (25) for changing the steering angle of travel tires (3) in association with the rotation of the guide frame (22) about the rotation axis.
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