Provided is a gelling agent containing N-acyl acidic amino acid dialkylamide having a DL form ratio (D form/L form (weight/weight)) of 5/95 - 20/80 or 80/20 - 95/5, and using the gelling agent, a gel composition, particularly a rod-like gel composition, superior in transparency and strength, and superior in compatibility and spreadability when applied to the skin, hair and the like is provided.
