PROBLEM TO BE SOLVED: To drain lower-temperature water into a drain hole in a water receiving portion rather than the water flowing out into a bathtub when showering the head with the lower-temperature water when bathing in a bathtub unit which comprises a bathtub retaining bathing warm water therein and a water receiving portion for receiving water of which temperature is lower than the warm water in the bathtub.SOLUTION: A water stopper 6 attached around the neck of the bather has a main body portion 61 with a larger area than the bathers head and is formed as a plane which can maintain the shape when the main body portion 61 receives lower-temperature water, and which has an insertion hole 62 formed, through which the bathers head is inserted to allow the water stopper to be attached around the bathers neck. The inner peripheral portion 63 of the insertion hole 62 of the main body portion 61 is configured to be freely expandable in a circumferential direction. A fixing portion 65 is formed at least in a portion in a circumferential direction of the outer peripheral portion 64 of the main body portion 61, the fixing part 65 being inserted within the water receiving portion 3 in such a manner as to be prevented from dropping out within the water receiving portion 3.COPYRIGHT: (C)2015,JPO&INPIT【課題】入浴用の温水が貯留する入浴槽と入浴槽内の温水より低温の低温液を受ける受水部とを備えた浴槽ユニットにおいて、入浴中に頭部に低温液を浴びるときに、低温液を入浴槽へ流出させずに受水部の排出孔へ排水する。【解決手段】入浴者の首の周りに装着される遮水具6の本体部61に頭部より大きい面積を与え、頭部が挿通して首周りに配置される挿通孔62を形成しながら、本体部61を低温液を受けたときに形態を維持し得る面状に形成する。本体部61の挿通孔62周りの内周部63を周方向に伸縮自在にし、本体部61の外周部64の少なくとも周方向の一部に、受水部3内に挿入され、受水部3内で抜け止めされる定着部65を形成する。【選択図】図1
