Super-cooling release material and method for producing same

A supercooling release material for releasing the supercooled state of a cold-storage material including one or more types of halogenated alkyl ammonium aqueous solution for producing a hydrate by cooling to the hydrate-formation temperature or below, the supercooling release material including an alkyl ammonium ion included in the cold-storage material, and a metal halide ion having as a constituent element a halogen element included in the cold storage material. Using a supercooling release material provided with such a configuration makes it possible to reliably release the supercooled state of a cold-storage material.