Gas diffusion electrode and production method therefor

A gas diffusion electrode comprising a conductive porous substrate and a microporous layer,

• wherein the microporous layer comprises at least a first microporous layer and a second microporous layer;
• wherein the first microporous layer contains electrically conductive fine particles and a first hydrophobic polymer and is located on a side of the microporous layer which is in contact with the conductive porous substrate;
• wherein the second microporous layer contains electrically conductive fine particles and a second hydrophobic polymer and is located on a side of the microporous layer that is opposite to the side of the first microporous layer which is in contact with the conductive porous substrate, and the conductive porous substrate is located on an outermost surface of the gas diffusion electrode, on the side of the first microporous layer which is opposite to the second microporous layer;
• and
• wherein the first hydrophobic polymer is a resin having a melting point lower than a melting point of the second hydrophobic polymer, and wherein the first microporous layer has a thickness of 9.9 um or more and 50 um or less.