To provide a structure having fewer restrictions on an installation place.

Right and left side faces of a conveyor frame 31 of a token conveying belt conveyor 3 are installed with longitudinally directed guide frames 61 at a prescribed interval back and forth in the conveying direction such that the guide frames 61 extend downward, auxiliary rollers 63 are rotatably journaled to the front and rear guide frames 61 below a return path of a belt 32, a position between the front and rear guide frames 61 is vertically movably disposed with a movement frame 64 rotatably journaling a tension roller 65, the return path of the belt 32 is pulled out downward from between the front and rear auxiliary rollers 63 and is stretched to the tension roller 65, the guide frames 61 and the movement frame 64 are connected by tension springs 66, the movement frame 64 is urged downward, and a motor 7 rotating the tension roller 65 is installed to the movement frame 64.