To provide an instrument by which a reinforcing-bar can be worked with force less than before at the time of bending the bar on a steep slope and working efficiency is enhanced.

The front end of the reinforcing-bar bending instrument is branched into two parts each of which forms a reinforcing-bar bending tool in parallel with an interval to each other, each having a reinforcing-bar insertion part. Arm bars 2 are connected to movable supporting points 4 in the upper part of the tool. A handle 3 is connected to the movable supporting points 4. Thus the bend working of the reinforcing-bar can be executed with power less than before owing to the relationship of the distance interval between a force point and the supporting point which transfers bending stress to a reinforcing-bar.