To provide a metal filter formed into a cup shape for removing impurities contained in molten metal during casting, in which vertical and horizontal lines of short lengths fitted at the four direction peripheral edge of an opening edge part are prevented from separating from the opening edge part by pressure when pouring molten metal and mixing into the molten metal.

In a metal filter A made by press-forming of a wire gauze in which vertical lines 1 and horizontal lines 2 made of metal wires are woven so as to cross and keep a predetermined distance from each other, crossing parts of the vertical lines 1 and horizontal lines 2 forming the opening edge part A3 are pressed flat at the time of press-forming to form recessed parts 3 and 4 engaged with each other to the opposing surfaces where the vertical lines 1 and the horizontal lines 2 are overlapped each other. The vertical lines 1 and the horizontal lines 2 forming an outer peripheral end part of the opening edge part A3 are prevented from separating from the opening edge part by the engaged recessed parts 3 and 4.