A hydrogel-forming material for preparing hydrogel even after a process of stirring gelator in medium heat to dissolve and disperse the gelator, and cooling the mixture to room temperature with stirring, a hydrogel material wherein a gel can reform by standing at room temperature even after a hydrogel obtained using the material is converted into sol by shaking The hydrogel-forming material with lipid peptide gelator includes Formula (1) or a pharmaceutically usable salt thereof:R1 is a C9-23 aliphatic group, R2 is a hydrogen atom or C1-4 alkyl group optionally having a C1-2 branched chain, R3 is a —(CH2)n-X group, n is 1-4, and X is an amino-group, guanidino group, —CONH2 group, 5-membered ring optionally having 1-3 nitrogen atom(s), 6-membered ring optionally having 1-3 nitrogen atom(s), or fused heterocycle composed of 5-memberd and 6-membered rings optionally having 1-3 nitrogen atom(s), water, and fatty acid salt as additive.
