PROBLEM TO BE SOLVED: To provide a bathtub which enables a bathing posture of a bather to be close to a standing posture as far as possible.SOLUTION: A bathtub 100 comprises: a bather holding part 103 formed of one side face 101 and a bottom face 102 of the bathtub 100. The bather holding part 103 comprises: a side face protrusion part 101a protruding in an inside direction of the bathtub 100 from the side face 101, and capable of holding a waist part of a bather 201 and a bottom face protrusion part 102a which protrudes in an inside direction of the bathtub 100 from the bottom face 102, the bottom face protrusion part 102a including a protrusion face 102a1 extending from a cross position CP where the bottom face 102 crosses the side face 101, and height from the bottom face 102 becomes higher as a distance from the cross position CP becomes larger, and a recessed part 102a2 which is recessed from the protrusion face 102a1 toward the bottom face 102 in the vicinity of the cross position CP, and capable of holding a hip part of the bather.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】入浴者の入浴姿勢を出来る限り立位時の姿勢に近付けることが可能な浴槽を提供する。【解決手段】浴槽100は、浴槽100の一の側面101と底面102とによって形成された入浴者保持部103を備える。入浴者保持部103は、側面101から浴槽100の内側方向に突出すると共に入浴者201の腰部を保持可能な側面凸部101aと、底面102から浴槽100の内側方向に隆起する底面隆起部102aであって、底面102と側面101とが交わる交差位置CPから伸びると共に交差位置CPから離れるほど底面102からの高さが高くなる隆起面102a1、及び、交差位置CPの近傍にて隆起面102a1から底面102に向けて窪むと共に入浴者の臀部を保持可能な凹部102a2、を含む底面隆起部102aと、を有する。【選択図】図1
