To provide a simple production apparatus for bath carbonate spring, capable of maintaining high concentration carbon dioxide over a long period of time by quickly, easily and surely dissolving, agitating and dispersing a powdery alkaline component and an acid component into bath hot water, thereby continuously generating the carbon dioxide in the bath hot water.

The simple production apparatus for bath carbonate spring includes an alkaline or acid powdery component dissolving, agitating and dispersing device body comprising: a dissolution tank with a lid, the tank having a plurality of small holes arranged on a tank peripheral surface, through which bath hot water is taken into the dissolution tank, and the upper portion of the tank floating on a hot water surface; and a submerged pump connected to the lower portion of the tank or positioned in the bath hot water. The powdery alkaline component or acid component-charged dissolution tank is sunk deeply in the bath hot water, and both powdery components are each separately dissolved and agitated by receiving a swirling flow generated by the submerged pump for circulating and returning hot water in a bathtub, and the powdery components gently contact with each other by being repeatedly circulated, returned and dispersed deeply as a solution shape into the bath hot water of the bathtub, so that the high concentration carbon dioxide is continuously generated and maintained over the long period of time.