To provide a gas hydrate generation apparatus having high gas hydrate generation capacity and improved generation efficiency.

A gas hydrate is generated by setting a mixing nozzle 20 for mixing and blowing water and a gas in a production and storage tank 2 and a gas blowing section 21 for blowing an extremely low-temperature gas being hydrated near the mixing nozzle 20. The gas blown out of the gas blowing section 21 is formed by a compression turbine 13 for adiabatically comprising the gas, an expansion turbine 14 for adiabatically expanding the adiabatically compressed gas, a motor 11 for driving a shaft 12 which links the compression turbine 13 with the expansion turbine 14, and a microcompressor/turbine apparatus 10 having heat exchangers 15 and 16 for cooling the gas adiabatically compressed by the compression turbine 13.