PROBLEM TO BE SOLVED: To take a bath while lying facing upward, to stimulate the surface of skin by injecting air and jet water whose side peripheral surface is coated with air from a side surface and a bottom surface within a bathtub to skin of a body lying facing upward, to enhance the washing effect of the body, to relieve fatigue and to relax the body. ;SOLUTION: This bathtub is constituted of a head bathtub part 2 in which the head part is put while lying facing upward and a body bathtub part 3 in which the body is put while lying facing upward. On the bottom surface of the body bathtub part 3, an air jetting reservoir 32 closed by a porous plate is provided. On the internal side surface of the body bathtub part 3, each of a plurality of nozzles 34 is formed. At the inside of each nozzle 34, a gas-liquid injection nozzle 41 injecting jet water injected by high pressure in a state that a side peripheral surface of jet water is cylindrically coated with high pressure air which is simultaneously jetted into bathtub water of the body bathtub part 3 is mounted.;COPYRIGHT: (C)2000,JPO
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