PURPOSE: To miniaturize a device and to make it lightweight by switching circulation of water in a water storage container into a mineral addition container and feeding of water for injecting mineral water by a switching valve.

CONSTITUTION: In the case of production of mineral water, a specified quantity of city water, etc., is stored in the water storage container, and a flow-in port of the switching valve 50 is made to communicate with a flow-out port in the other side. At this time, a circulation switch 81 is closed. At this state, a changeover switch 85 is operated to a circulation side. Next, a power source switch 84 is turned on and a motor is driven and a water feed pump is worked. Then, the water in the water storage container is fed to a mineral ore storage room and circulated to form mineral water. When this mineral water is poured into a cup, etc., the switch valve 50 is communicated with a flow-out port in the other side and the water injection switch 82 is closed. Next, the changeover switch 85 is connected with a water injection side.