To easily enable bending metallic materials such as a metallic strip and angle bar into a circular body having high out-of-roundness and, furthermore, to enable mass-production of the high-quality circular body without variation in the quality.

The bending machine 1 for metallic materials is a machine for forming the metallic circular body by adding pressure in a bending direction to the metallic materials. Plural pairs of pressure rolls 3, 3 between which the metallic materials is held are arranged so that the opposed parts of each pair is situated on the circumference where the circular body after working becomes a circle having a prescribed diameter. While pressurizing the metallic material to be bent between the plural pairs of pressure rolls 3, 3, the material is successively moved and formed into the circular body. The plural pairs of the pressure rolls 3, 3 are arranged in the range of approximately 90° on the circumference where the circular body after working becomes a circle having the prescribed diameter.