To obtain a manufacturing method of attachment fittings for curtain walls which are used for skyscrapers having flexible structure.

In this manufacturing method of metal fittings for fixing curtain walls, after the material which is worked into a billet is heated and extruded from the die D with an extruder having the die, the material is cooled and made into a product, the die D of the extruder has a pass which is hollowed out into approximately L-shape consisting of a horizontal part 1 and a vertical part 2 and the die the outside of the vertical part 2 of the approximately L- shaped pass of which is made into a circular arc 20 shape is used. The approximately L-shaped pass A of the die D is provided by hollowing out projecting and recessed notches 1c on the upside of the horizontal part 1. Further, in the approximately L-shaped pass A of the die D, an eaves-shaped projected part (height adjusting bolt holder) 3 where is hollowed out in parallel to the horizontal part in the upper part of the vertical part 2 is provided.