A moisturizing base material that contains a lipid peptide compound including at least one of compounds of Formula (1) below and simulated compounds thereof or pharmaceutically usable salts thereof, a surfactant, a specific polyhydric alcohol, a fatty acid, and water.wherein R1 is a C9-23 aliphatic group; R2 is a hydrogen atom or a C1-4 alkyl group that optionally has a branched chain having a carbon atom number of 1 or 2; and R3 is a —(CH2)n—X group; n is a number of 1 to 4; and X is amino group, guanidino group, —CONH2 group, or a 5-membered cyclic group optionally having 1 to 3 nitrogen atoms, a 6-membered cyclic group optionally having 1 to 3 nitrogen atoms or a condensed heterocyclic group constituted by a 5-membered cyclic group and a 6-membered cyclic group which optionally have 1 to 3 nitrogen atoms.