Filtration filter

A filtration filter, comprising:

• a metallic porous membrane having a center and including:
• upper and lower opposed main surfaces;
• an inner membrane portion for filtering objects contained in a fluid, the inner membrane portion extending outwardly from the center of the metallic porous membrane and lying in a plane;
• and
• a held portion extending outwardly from an outer periphery of the inner membrane portion;
• a lower frame having first and second edges;
• and
• an upper frame having first and second edges, the first edge of the upper frame being located inward of and below the first edge of the lower frame, the second edge of the upper frame being located outwardly of and above the first edge of the lower frame, the second edge of the lower frame being located outward of and above the second edge of the upper frame, the held portion being bent around the first, second, third and fourth edges in a zig zag manner.