PURPOSE: To accurately weld the hole preliminarily provided to a handbag in the vicinity of the mouth edge thereof and an annular reinforcing frame without generating positional shift when the reinforcing frame is welded to the hole.

CONSTITUTION: When reinforcing frames are supplied to the upper and lower parts of the hole 11 of a bag B at determined positions, the hole 11 of the bag B is preliminarily fitted in guides 40a, 40b to make the position of the hole 11 constant and, thereafter, the reinforcing frames are supplied to the upper and lower parts of the hole 11 of the bag to be pressed by a pair of upper and lower press members 26, 29.