To provide a ball box transporting undercarriage with the excellent strength in an undercarriage body on the whole and also in a handle inserting part.

The undercarriage has the plastic undercarriage body 1 opening downward with a rectangular upper wall part 7 and a peripheral wall part 8. The undercarriage also has a pair of left and right metal channel materials 13 abutting to the undercarriage body 1 from the rear side and fixed with fasteners 12, whose section is U-shaped, and wheels 4 fixed to the channel materials 13 with the fasteners 12. In addition, a metal short cylinder 22 for inserting a handle is fixed to each channel material 13 by the welding Y.