[PROBLEMS TO BE SOLVED] It is an object of the present invention to provide a gelator containing a long chain oxyaminopolyol capable of forming a gel with a small amount thereof over a liquid property range from acidic to alkaline, and a gel having high environmental suitability, biocompatibility and biodegradability.[MEANS FOR SOLVING THE PROBLEMS]A gelator, characterized by containing a long chain oxyaminopolyol of Formula (I): (where R1 is a C12-16 saturated aliphatic group or a C12-16 unsaturated aliphatic group having one double bond; R2 is a substituent which an amino acid has; and X is an oxygen atom or NH)and a pharmaceutically acceptable salt thereof; a self-assembly formed by the self-assembly of the gelator; and a gel containing the gelator or the self-assembly, and water, an aqueous solution, a hydrophilic organic solvent or a hydrophilic organic solution, or a hydrophobic organic solvent or a hydrophobic organic solution.
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