To prevent guide rollers attached to a conveying vehicle from colliding hard with side walls of a track, and to prevent a drop in feeding efficiency at a curved portion.

The guide rollers 24, 24 are provided on the right and left of the conveying vehicle 13, and the side walls 41, which serve to run the conveying vehicle 13 along the direction of the track 12 by regulating the lateral position of the guide roller 24, are provided on the right and left sides of the track 12. Branching rollers 26 advanceable toward the track 12 are provided on the conveying vehicle 13, and, at a branching portion where a branch track 12b and a main track 12a are joined, a pair of guiding surfaces 155A, 155B regulating the lateral position of the advanced branching rollers 26 is provided along both tracks 12a, 12b. The guiding surface 155A with a large radius of curvature is sufficiently deviated toward the side wall 41 with a small radius of curvature, so that the side wall 41 with the large radius of curvature and the guide roller 24 on this side wall 41 side do not contact each other, in a state where the advanced branching roller 26 is in contact with the guiding surface 155A.