To provide a ribbon screw type mobile body realizing miniaturization by a structure in which the height is particularly suppressed low as a traveling means for a working vehicle and a conveying unit and capable of traveling not only on a general road but also a particular site where a ground is soft.

The ribbon screw type mobile body 1 is constituted by a pair of ribbon screws 3 arranged in an almost chevron shape toward a horizontal direction; and a screw drive device 4. In this case, the first and second ribbon screws 3 are symmetrically arranged and the angle between the respective ribbon screws 3 is set such that a direction of a blade 302 contacted with traveling surfaces of the respective ribbon screws 3 is perpendicular to a symmetrical central axis between the respective ribbon screws 3. Further, the blade 302 comprises two or three strips and a helical angle is set to 40 to 45°. The ribbon screw is preferably in a rotation drive form.