An object is to provide dispersion containing lipid peptide type compound useful as low molecular weight gelator, such as lipid dipeptide and lipid tripeptide, and dissolution accelerator capable of dissolving the lipid peptide type compound at lower temperature and more easily. It is also an object to provide dispersion that can form hydrogel by simpler method and under milder condition (low temperature) and from which gel can be obtained as gel having high thermal stability, and provide method for forming the gel. Dispersion including: a lipid peptide type compound in which peptide portion formed by repetition of at least two or more identical or different amino acids is bonded to lipid portion including C10-24 aliphatic group; dissolution accelerator having, in molecules thereof, hydrophilic portion and hydrophobic portion, the hydrophilic portion having betaine structure; and water; and method for producing hydrogel by use of the dispersion.