A resin composition for an electrode of a power storage device, comprising: polymer particles containing a constitutional unit (A-2) derived from a compound expressed by the following formula and a constitutional unit (B-2) derived from at least one compound selected from a compound expressed by the following formula, a compound expressed by the following formula, and unsaturated dibasic acid, wherein the polymer particles are obtainable by emulsion polymerization of a monomer mixture containing a compound expressed by the formula, at least one compound selected from a compound expressed by the formula, a compound expressed by the formula, and unsaturated dibasic acid, wherein the amount of an emulsifier used in the emulsion polymerization is 0.05% by mass or less with respect to the total amount of monomers, a content of the constitutional unit (A-2) in all constitutional units of the polymer particles is 50% by mass or more and 99.9% by mass or less, a content of the constitutional unit (B-2) in all constitutional units of the polymer particles is 0.1% by mass or more and 20% by mass or less, and a surface tension of the resin composition is 55 mN/m or more, in the formula, R 1 represents a hydrogen atom or a methyl group; R 2 represents at least one selected from a linear or branched alkyl group having 1 to 6 carbon atoms and -CH 2 OR 3; R 3 represents a linear or branched alkyl group having 4 to 6 carbon atoms; and X represents -O- or -NH-, in the formula, R 1 represents a hydrogen atom or a methyl group; and M represents a hydrogen atom or a cation, in the formula, R 1 represents a hydrogen atom or a methyl group; X represents -O- or -NH-; R 4 represents at least one selected from - n OH, -R 5 SO 3 M, -R 6 N(R 7)(R 8), and -R 6 N + (R 7)(R 8)(R 9)·Y -; n represents 1 or more and 4 or less; R 5 represents a linear or branched alkylene group having 1 to 5 carbon atoms; M represents a hydrogen atom or a cation; R 6 represents a linear or branched alkylene group having 1 to 4 carbon atoms; R 7 and R 8 are the same or different and represent a linear or branched alkyl group having 1 to 3 carbon atoms; R 9 represents a linear or branched alkyl group having 1 to 3 carbon atoms; and Y - represents an anion, wherein the surface tension of the resin composition is obtained by measuring a surface tension of a polymer particle dispersion at a temperature of 20°C, which is a solution that has been diluted with pure water until the solid content was 0.03% by mass. polymer particles containing a constitutional unit (A-2) derived from a compound expressed by the following formula and a constitutional unit (B-2) derived from at least one compound selected from a compound expressed by the following formula, a compound expressed by the following formula, and unsaturated dibasic acid, wherein the polymer particles are obtainable by emulsion polymerization of a monomer mixture containing a compound expressed by the formula, at least one compound selected from a compound expressed by the formula, a compound expressed by the formula, and unsaturated dibasic acid, wherein the amount of an emulsifier used in the emulsion polymerization is 0.05% by mass or less with respect to the total amount of monomers, a content of the constitutional unit (A-2) in all constitutional units of the polymer particles is 50% by mass or more and 99.9% by mass or less, a content of the constitutional unit (B-2) in all constitutional units of the polymer particles is 0.1% by mass or more and 20% by mass or less, and a surface tension of the resin composition is 55 mN/m or more, in the formula, R 1 represents a hydrogen atom or a methyl group; R 2 represents at least one selected from a linear or branched alkyl group having 1 to 6 carbon atoms and -CH 2 OR 3; R 3 represents a linear or branched alkyl group having 4 to 6 carbon atoms; and X represents -O- or -NH-, in the formula, R 1 represents a hydrogen atom or a methyl group; and M represents a hydrogen atom or a cation, in the formula, R 1 represents a hydrogen atom or a methyl group; X represents -O- or -NH-; R 4 represents at least one selected from - n OH, -R 5 SO 3 M, -R 6 N(R 7)(R 8), and -R 6 N + (R 7)(R 8)(R 9)·Y -; n represents 1 or more and 4 or less; R 5 represents a linear or branched alkylene group having 1 to 5 carbon atoms; M represents a hydrogen atom or a cation; R 6 represents a linear or branched alkylene group having 1 to 4 carbon atoms; R 7 and R 8 are the same or different and represent a linear or branched alkyl group having 1 to 3 carbon atoms; R 9 represents a linear or branched alkyl group having 1 to 3 carbon atoms; and Y - represents an anion, wherein the surface tension of the resin composition is obtained by measuring a surface tension of a polymer particle dispersion at a temperature of 20°C, which is a solution that has been diluted with pure water until the solid content was 0.03% by mass.