Guided devices are connected to the front and rear ends of the main body of a moving body. Each guided device is connected in a relatively rotatable fashion about a lateral axle to the lower part of a vertical shaft. A lateral roller supporting body is connected to the vertical shaft, and guide rollers supported and guided by guide bodies disposed in prescribed positions in a fixed path are provided on the right and left-hand ends of the roller support body. During movement, the roller supporting body connected to the vertical shaft too rotates integrally, and the axis of a lateral axle supporting the pair of right and left-hand guide rollers can be orientated orthogonal to the fixed path, whereby the guide rollers are able to rotate smoothly without causing slipping or frictional resistance. Thereby, the supporting unit can always be supported and guided smoothly in curved path sections.