To provide a bathtub capable of safely and easily solving former problems such as easily putting a person to be taken care of into or out of the bathtub, rapidly adjusting relative water level of hot water in the bathtub against the body of the person to be taken care of, and preventing the person to be taken care of from being drowned in the bathtub.

This bathtub is provided with a side wall which delimits the side part of the storing area of bathwater and a bottom wall 5 which seals the lower part of the storing area of bathwater, wherein the side wall has a structure comprising of ring-like soft tubes and is provided with an inflow and exhaust hole for inflowing and exhausting air to and from a hollow part 1 of the side wall.