Provided is a high concentration carbonated spring generating device capable of steadily generating a high concentration carbonated spring in a short time even in existing bathtub hot water. By immersing both side ends of a circulation flow path forming pipe provided with a circulation pump in hot water or water in a bathtub, hot water or water in the bathtub can be circulated by a circulation pump through the circulation flow path forming piping and the bathtub , A carbon dioxide gas supply part for supplying carbon dioxide gas is connected to the circulation flow passage forming pipe at the downstream side of the circulation pump and the carbon dioxide gas is refined to a particle size including less than 1 m, Or a fluid mixer which mixes homogeneously with water to form a gas-liquid mixed fluid is disposed on the downstream side of the carbon dioxide gas supply section and circulates the gas-liquid mixed fluid through the fluid mixer, thereby forming a high concentration carbonated spring Can be generated.既存の浴槽湯においても、短時間にかつ堅実に高濃度炭酸泉を生成することができる高濃度炭酸泉生成装置を提供すること。 浴槽内の湯ないしは水中に、循環ポンプを設けた循環流路形成配管の両側端部を浸漬することで、循環流路形成配管と浴槽内を通して浴槽内の湯ないしは水を循環ポンプにより循環可能とし、循環流路形成配管には、炭酸ガスを供給する炭酸ガス供給部を、循環ポンプの下流側に位置させて接続し、かつ、1μm未満を含む粒径まで炭酸ガスを微細化するとともに、湯ないしは水と均一に混合して気液混合流体となす流体混合器を、炭酸ガス供給部の下流側に配設して、流体混合器中を通して気液混合流体を循環させることで高濃度炭酸泉を生成可能とした。
