To provide a method and a device for forming hydrate by using a heat storage tank, capable of forming hydrate substantially in a resting state in forming hydrate by using a liquid guest substance and water as a host substance.

A heat storage body 11 receiving the liquid guest substance and the water as the host substance is disposed in a heat storage tank 10, the heat storage tank 10 is filled with a refrigerant 12 cooled by a main refrigerating machine 13, a supercooling section 18 is disposed in the heat storage body 11 to supercool the liquid guest substance and the host substance to be lower than a clathrate hydrate formation temperature, species of the clathrate hydrate is formed by supercooling the liquid guest substance and the host substance at the supercooling section 18, and the formation of hydrate is transmitted on the basis of the species to produce the clathrate hydrate.

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