To provide a metal fitting of a separator, preventing dislocation from a fastening shaft in breaking a separator to be locked, and stabilizing fitting of the separator.

This metal fitting is formed by a combination of a metal fitting body in which the separator is driven to be locked and the fastening shaft with a locking flange passed through a molding box and fastened by an outer clamp. The body is formed like a square tube so that the upper and lower and the front and back sides are enclosed, and a cutout front hole in which the separator is driven so as not to eject is provided from the top face to the front. Further a cutout rear hole in which the fastening shaft is locked by the locking flange at the tip is provided from the back to the bottom. The back port of the cutout rear hole is formed like a tunnel hole for passing the fastening shaft with the upper end closed so that the locking flange does not come off.