PURPOSE: To provide a method where the highly precise bending can be made to a work of small width, and a magnetic head can be positioned with high precision even when the width of the head base is reduced by the highly dense packaging of the magnetic head.

CONSTITUTION: A regulating member 20 is positioned on the rear side of a head base 2 where a head chip 1 is attached on the tip by a stage 21. When the laser beam emitted from a YAG laser beam source 6 is directly converged to the head base 2 which is a work, the temperature in the vicinity of an irradiated part 10 rises, and the tip part of the head base 2 is displaced downward by the thermal expansion. However, the regulating member 20 restricts this displacement, and the irradiated part 10 causes the thermal plastic deformation. When the irradiated part 10 is cooled to cause the thermal contraction, the contraction exceeding the condition before the irradiation is generated, and the head base 2 is folded in the upwardly recessed manner to be stopped, and the bending is realized thereby.