<p>[PROBLEMS] To provide an electrode substrate for a dye-sensitized solar cell, which has a dye-sensitized semiconductor porous layer having a structure which can improve conversion efficiency. [MEANS FOR SOLVING PROBLEMS] A dye-sensitized semiconductor porous layer formed on an electrode substrate surface is formed of spherical oxide semiconductor fine particles (A) and oxide semiconductor fine particles (B) having various shapes with particle diameters smaller than the diameter of the spherical oxide semiconductor fine particles. The dye-sensitized semiconductor porous layer has a porosity of 60% or higher, and the maximum peak of the fine pore capacity measured by BET method in the semiconductor porous layer exists in a region having a fine pore diameter of 30nm or more.</p>
