A solid base material for skin external application, the solid base material comprising: 1% by mass to 20% by mass with respect to the total mass of the solid base material for skin external application of at least one surfactant selected from the group consisting of ethylene glycol alkyl ether, phospholipid, polyglycerol fatty acid esters, and polyoxyethylene polyoxypropylene alkyl ether; 1% by mass to 20% by mass with respect to the total mass of the solid base material for skin external application of a 1,2-alkanediol or glycerol; 0.1% by mass to 2.0% by mass with respect to the total mass of the solid base material for skin external application of at least one fatty acid; 60% by mass to 95% by mass with respect to the total mass of the solid base material for skin external application of water; and 1% by mass to 20% by mass with respect to the total mass of the solid base material for skin external application 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. 1% by mass to 20% by mass with respect to the total mass of the solid base material for skin external application of at least one surfactant selected from the group consisting of ethylene glycol alkyl ether, phospholipid, polyglycerol fatty acid esters, and polyoxyethylene polyoxypropylene alkyl ether; 1% by mass to 20% by mass with respect to the total mass of the solid base material for skin external application of a 1,2-alkanediol or glycerol; 0.1% by mass to 2.0% by mass with respect to the total mass of the solid base material for skin external application of at least one fatty acid; 60% by mass to 95% by mass with respect to the total mass of the solid base material for skin external application of water; and 1% by mass to 20% by mass with respect to the total mass of the solid base material for skin external application 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.