To connect with a coupler provided on a rear car at its lower position with modifications applied to the rear car minimized and to increase loading amount for the rear car and to enhance maneuverability stability.

This traction device 11 for a rear car 1 is composed of a frame body 12 expanded from the rear car 1 body 2 at the lower front toward the front, a supporting bar 13 upwardly expanded from the frame body 12. Where, the frame body 12 has a shape, a V shape narrowed toward the front in plain view. Its base 14 is demountably fixed to the front of the rear car 1 body 2 at its both lower right and left corners. The top 20 of the frame 12 is bendably, twistably coupled with a coupler 10 provided to a tractor at its lower position. The supporting bar 13 upwardly expands from the vicinity of the top 20. The extreme end of the supporting bar 13 is demountably fixed to near the rear car 1 at its extreme end of a pull 4.