To provide a direct methanol fuel cell that delivers a high power output by improving the discharging performance of product materials and the supplying performance of reactant materials.

A membrane electrode assembly has a polymer electrolyte membrane disposed at its center, and electrodes consisting of an anode and a cathode disposed at both outer sides of the polymer electrolyte membrane. A separator has a surface in contact with the membrane electrode assembly that is replaced by a metal porous body. On a separator for a conventional direct methanol fuel cell, a trench-like passage has been provided on a surface in contact with the membrane electrode assembly, and discharge of product materials and supply of reactant materials have been performed through such a passage. On the other hand, the present invention requires no passage because the metal porous body substitutes for such a capability.