PROBLEM TO BE SOLVED: To provide a steam sauna dome for a bathtub that is safe in the contact, enables disassembly and cleaning of each part, prevents accidents by oxygen deficiency when in use, and can be used in a bath level and is free from the size and amount of hot water in the bathtub by use of a retainer.SOLUTION: A steam sauna dome for a bathtub is configured as follows: frameworks 1, 2, 3, 4, 5 are stacked, and a connecting bolt 6 is inserted in the hole provided in both ends to fix with connecting nuts 7 temporarily from the back a cover 8 for a dome is attached on the frameworks with a magic tape the dome is formed by spreading it with the frameworks 1, 2 in a fan shape the dome is tightened with the connecting nuts 7 when completed the frameworks 1, 2 coming into contact with the bath level of both ends are provided with buoyancy the dome can be used in the water surface and also can be used without worrying about the size and amount of hot water in the bathtub by use of a dedicated retainer 9 and a gap to prevent accidents by oxygen deficiency is provided in the frameworks 1 and 5.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】接触時にも安全で、各パーツ分解洗浄が可能で、使用時における酸素欠乏症を防ぎ、また湯面での使用は勿論の事、固定器具の使用により浴槽の大きさや湯量を選ばない浴槽用スチームサウナドームを提供する。【解決手段】骨組み部1、2、3、4、5を重ね、両端部に設けた穴に接続用ボルト6を差込み、裏から接続用ナット7で仮固定し、マジックテープがついた骨組み部にドーム用カバー8を装着し、骨組み部1、2を持って扇状に広げる事によりドームを形成し、ドームが完成したら、接続用ナット7で絞め込み、両端部の湯面に接触する骨組み1、2は浮力があり、水面での使用は勿論、専用固定器具9の使用により浴槽のサイズや湯量を気にせず使用する事が可能となり、また、骨組み部1及び5には酸素欠乏症を防ぐ為の隙間を設けている。【選択図】図1