<p>This aims to provide a porous filter cartridge which is hardly contaminated, which is advantageous in the cost aspect, and which can perform efficient filtration and extraction without any breakage. The porous filter cartridge includes a porous filter retained in the bottom and inside of a bottomed cylindrical cap (5) having a discharge opening (29) formed in the center of the bottom. A plurality of ribs (35, 37 and 39) for supporting the porous filter are erected radially around the discharge opening (29) in the bottom of the cap (5). At least any of those ribs is connected across the discharge opening (29) at the central portion of the discharge opening (29), and a protruding face (41) protruding toward the porous filter is formed on the crest face of a connected rib portion (43).</p>
