PURPOSE: To surely execute pipe bending work by mounting a matrix of bending members at a main supporting member of a parallel hexahedron, moving the matrix by a co-moving member, arranging connecting members and a counter matrix and disposing electromechanical control and transmission mechanisms and electronic interlock mechanism.

CONSTITUTION: The portable pipe bending machine which is capable of bending the pipe up to max. about 180° and is applicable to the pipes of the diameter from about 4 mm to 42 mm and thickness from about 0.5 mm to 2.5 mm is provided. This device is mounted with the bending member, i.e., the matrix 30 at the main supporting member 11 of the parallel hexahedron. The matrix 30 is moved by the co-moving member 32. A pair of the interconnectable connecting members 16, 19 and the counter matrix 31 having the main body of the parallel hexahedron are arranged. Further, the device is provided with the electromechanical control and transmission mechanisms and the electronic interlock mechanism. As a result, the pipes consisting of different materials which are extremely sensitive to the draft stress generated during the bending work may be bent 180°.