To provide a carbonate spring microbubble generator, a bubble dispersing shower device, a carbonate spring device and an atomizing discharge member, miniaturized with a simple structure which can be provided in close vicinity to a mixed water discharge end of a water heater.

The carbonate spring microbubble generator is used by being connected to a water heater mixed water outlet, and is composed of a flow switch, a check valve, a gas-liquid mixing fragmentation member, a connection member, a carbon dioxide conduit, a main part case and a gas conduit. The check valve and the gas-liquid mixing fragmentation member are connected in close vicinity in a straight line shape, and are fixed to the case, and are fixed and connected to a water heater mixed water outlet part by the connection member. After hot water flows out by operation of the flow switch, carbon dioxide is supplied to the gas-liquid mixing fragmentation member from the carbon dioxide conduit.