To provide a resin belt having a superior recurrent reflecting effect and which is installed on a telegraph pole, a safety-enhanced plane belt made of thermoplastic resin easily confirming night traveling, or a thermoplastic resin belt such as a toothed belt made of thermoplastic resin and its manufacturing method.

In the toothed belt 3 made of thermoplastic resin in which core wires 3c are buried within a belt body made of thermoplastic resin along a longitudinal direction and a toothed portion 3b is arranged in regular intervals, a glass bead material 30 having a recurrent reflecting function is stuck on a surface of a rear portion 3a of the belt at least at one place, and a safety property of the belt is enhanced for night traveling because the glass bead material has a superior recurrent reflecting effect.