NOVELTY - The methane hydrate manufacturing apparatus has pressure container (1) which bears predetermined high pressure. The porous board (7) divides the inside of the container into upper and lower spaces (2,8). The scraper (6) is provided in the upper space and the coolant evaporator (5) is arranged along the outer circumferential surface of the upper space.    USE - For manufacturing methane hydrate.    ADVANTAGE - Methane hydrate is manufactured efficiently by raking the hydrate adhered to internal surface of pressure container, using scraper. Methane hydrate is stably stored. The adherence of hydrate to internal surface of the apparatus is prevented.    DETAILED DESCRIPTION - The refrigerator (12) supplies coolant to the coolant evaporator. The raw water supply pipe (18) supplies water to the bottom of the upper space and the natural gas supply piping supplies natural gas to the lower space. The scraper includes blades. The scraper has support cross arm in the upper and lower sides to support the trunk. The scraper is supported rotatably. The cross arms are processed to have knife edge. The hydrate storage tank is connected with upper space outlet of the pressure container through the buffer tank. The hydrate storage tank bottom and raw water supply piping are connected. The heat release load piping is connected to the bottom of the hydrate storage tank and the other end of the piping is connected to upper space of the hydrate storage tank through a heat exchanger. The recirculation pipe is provided which returns unreacted natural gas for recycle and natural gas supplying pipe is provided from the gaseous phase portion of the hydrate storage tank.    An INDEPENDENT CLAIM is also included for methane hydrate manufacturing method which involves blowing fine bubbles of natural gas through porous board from lower space of pressure container into the circulating flow of raw water which flows out of upper space. The natural gas is made to contact with raw water in 0-6.5 degreesC at 26-60kg/cm-2 atmospheric pressure. The hydrate adhered to the support of the upper and lower sides of raked using knife edge of the cross arm. The buffer tank separates the methane, hydrate from the mixture of raw water, natural gas and formed methane hydrate and the separated methane hydrate is stored in a tank. The raw water separated from methane hydrate is extracted from the bottom of the hydrate storage tank and the bottom of the upper space of the pressure container is made to circulate the raw water. The natural gas retains in liquid phase into the upper space of the hydrate storage tank. The unreacted natural gas is reused as pulling out and raw gas. The coolant evaporator controls the temperature of the pressure container.    DESCRIPTION OF DRAWING(S) - The figure shows the methane hydrate manufacturing apparatus. (Drawing contains non-English text).    Pressure container (1)    Spaces (2,8)    Coolant evaporator (5)    Scraper (6)    Porous board (7)    Refrigerator (12)    Water supply pipe (18)