Fuel cell

A fuel cell comprising:

• a first electrode including a first gas diffusion layer having a first porous base material and a first catalyst layer having a second porous base material, the first electrode being supplied with an oxidant gas, the first catalyst layer being stacked to the first gas diffusion layer, the second porous base material containing a catalyst-activating material, an electrically-conductive material, and a proton-conductive material, the second porous base material having a pore diameter distribution with a first peak in a range of 0.04 μm to 0.12 μm, both inclusive, and a second peak in a range of 0.02 μm to 0.04 μm, both inclusive, the second porous base material having a volume ratio of pores with diameters of 0.04 μm to 0.12 μm, both inclusive, to all the pores being 17% or more, and the second porous base material having a total volume of the pores with diameters of not less than 0.1 μm being not more than 0.01 mL/g, the total volume being measured by a mercury penetration method;
• a second electrode including a second gas diffusion layer having a third porous base material and a second catalyst layer having a fourth porous base material, the second electrode being supplied with a fuel, the second catalyst layer being stacked to the second gas diffusion layer;
• and
• an electrolyte film held between the first catalyst layer of the first electrode and the second catalyst layer of the second electrode,
• wherein the catalyst-activating material includes catalysts that are only particles, and
• the first catalyst layer does not substantially include a fibrous supported catalyst.