To simultaneously change moving directions of right and left steering carrying rollers in a follower traveling side set under a bottom surface of a large-sized heavy article to be carried.

An electric motor 106 of a steering carrying roller 101 in an active turning side is driven by an operation signal from an operating portion 11 to rotate a worm gear 116, and a worm wheel 142 and a rotary base 135 meshed with the worm gear 116 are rotated to change moving directions of rollers 156, 156. Further, a worm gear 216 of a steering carrying roller 201 in a follower turning side is simultaneously rotated in the same direction through rotations of a rotation transmitting means 301 fitted with a projecting link portion 124 of a rotating shaft 119 of the worm gear 116, and a worm wheel 242 and a rotary base 235 meshed with the worm gear 216 are rotated to simultaneously change directions of rollers 256, 256 in the same direction.