PROBLEM TO BE SOLVED: To provide a carbonate spring generation device for turning on and off supply of carbon dioxide gas to a carbonic acid mixer by interlocking with turning-on-and-off of water conduction to a hot water passage, without using electronic equipment.SOLUTION: A carbonate spring generation device comprises a carbonic acid mixer 2 having a hot water inflow port, a carbon dioxide gas inflow port, a hot water carbon dioxide gas mixing chamber of communicating with the two inflow ports, a small diameter flow passage aggregate of communicating with the hot water carbon dioxide gas mixing chamber and dissolving hot water mixed with a carbon dioxide gas bubble and a carbonate spring outflow port of communicating with the small diameter flow passage aggregate, a hot water passage 5 for arranging the carbonic acid mixer 2 on the way and a carbon dioxide gas supply valve 3 having a diaphragm, a high pressure side pressure sensitive chamber for impressing hot water primary pressure in the hot water passage 5 on the upstream side more than the carbonic acid mixer 2 on one end surface of the diaphragm, a low pressure side pressure sensitive chamber for impressing hot water secondary pressure in the hot water passage 5 on the downstream side more than the carbonic acid mixer 2 on the other end surface of the diaphragm, a spring for energizing the diaphragm to the high pressure side pressure sensitive chamber side and a valve element for opening-closing a carbon oxide gas passage by interlocking with the diaphragm by engaging with the diaphragm.
