Porous separator for fuel cell

A porous separator for a fuel cell, comprising:

• a flow field plate having a first contact portion in contact with a gas diffusion layer or a membrane electrode assembly, a second contact portion in contact with a coolant channel, and a connection portion connected between the first contact portion and the second contact portion;
• and
• a passage aperture formed in the connection portion,
• wherein a portion of an inside surface of the passage aperture forms a protruding portion protruding toward a center of the passage aperture,
• wherein the protruding portion protrudes toward a centerline from a portion of a first inside surface of the passage aperture when the centerline is extended in a longitudinal direction of the passage aperture to pass opposing midway points of the passage aperture in a widthwise direction of the passage aperture,
• wherein the protruding portion is formed on the first inside surface of the passage aperture that is closer to the first contact portion than the second contact portion, and
• wherein the protruding portion is formed to extend toward the gas diffusion layer or the membrane electrode assembly and to be bent at a predetermined inclination angle with respect to a plane where the protruding portion is flush with the gas diffusion layer or the membrane electrode assembly.