A solid base material for skin external application, the solid base material comprising: 1% by mass to 5% by mass of a surfactant; 1% by mass to 5% by mass of a 1,2-alkanediol or glycerol; water; and 4% by mass to 5% by mass of a lipid peptide compound including at least one of compounds of Formulae to or pharmaceutically usable salts of the compound: where R 1 is a C 9-23 aliphatic group; R 2 is a hydrogen atom, or a C 1-4 alkyl group that may have a C 1 or C 2 branched chain; and R 3 is a -(CH 2) n -X group, where n is a number from 1 to 4, and X is amino group, guanidino group, -CONH 2 group, or a 5-membered or 6-membered ring that may have 1 to 3 nitrogen atoms or a condensed heterocycle composed of 5-membered and 6-membered rings that may have 1 to 3 nitrogen atoms where R 4 is a C 9-23 aliphatic group; R 5 to R 7 are each independently a hydrogen atom, a C 1-4 alkyl group that may have a C 1 or C 2 branched chain, or a -(CH 2) n -X group, where n is a number from 1 to 4, and X is amino group, guanidino group, -CONH 2 group, or a 5-membered or 6-membered ring that may have 1 to 3 nitrogen atoms or a condensed heterocycle composed of 5-membered and 6-membered rings that may have 1 to 3 nitrogen atoms where R 8 is a C 9-23 aliphatic group; R 9 to R 12 are each independently a hydrogen atom, a C 1-4 alkyl group that may have a C 1 or C 2 branched chain, or a -(CH 2) n -X group, where n is a number from 1 to 4, and X is amino group, guanidino group, -CONH 2 group, or a 5-membered or 6-membered ring that may have 1 to 3 nitrogen atoms or a condensed heterocycle composed of 5-membered and 6-membered rings that may have 1 to 3 nitrogen atoms, wherein the surfactant is at least one selected from the group consisting of ethylene glycol alkyl ether, phospholipid, polyglycerol fatty acid esters, and polyoxyethylene polyoxypropylene alkyl ether. 1% by mass to 5% by mass of a surfactant; 1% by mass to 5% by mass of a 1,2-alkanediol or glycerol; water; and 4% by mass to 5% by mass of a lipid peptide compound including at least one of compounds of Formulae to or pharmaceutically usable salts of the compound: where R 1 is a C 9-23 aliphatic group; R 2 is a hydrogen atom, or a C 1-4 alkyl group that may have a C 1 or C 2 branched chain; and R 3 is a -(CH 2) n -X group, where n is a number from 1 to 4, and X is amino group, guanidino group, -CONH 2 group, or a 5-membered or 6-membered ring that may have 1 to 3 nitrogen atoms or a condensed heterocycle composed of 5-membered and 6-membered rings that may have 1 to 3 nitrogen atoms where R 4 is a C 9-23 aliphatic group; R 5 to R 7 are each independently a hydrogen atom, a C 1-4 alkyl group that may have a C 1 or C 2 branched chain, or a -(CH 2) n -X group, where n is a number from 1 to 4, and X is amino group, guanidino group, -CONH 2 group, or a 5-membered or 6-membered ring that may have 1 to 3 nitrogen atoms or a condensed heterocycle composed of 5-membered and 6-membered rings that may have 1 to 3 nitrogen atoms where R 8 is a C 9-23 aliphatic group; R 9 to R 12 are each independently a hydrogen atom, a C 1-4 alkyl group that may have a C 1 or C 2 branched chain, or a -(CH 2) n -X group, where n is a number from 1 to 4, and X is amino group, guanidino group, -CONH 2 group, or a 5-membered or 6-membered ring that may have 1 to 3 nitrogen atoms or a condensed heterocycle composed of 5-membered and 6-membered rings that may have 1 to 3 nitrogen atoms, wherein the surfactant is at least one selected from the group consisting of ethylene glycol alkyl ether, phospholipid, polyglycerol fatty acid esters, and polyoxyethylene polyoxypropylene alkyl ether.