PROBLEM TO BE SOLVED: To effectively utilize hydrogen gas in a large bathtub without applying labor to the large bathtub, and to improve coldness, cosmetic effect, fatigue recovery effect, skin disease improvement or diet effect on human shoulders. The body part consisting of the body, back or abdomen, waist, thighs, knees, legs and insteps is mainly supplied with hydrogen so that these body parts can be mainly improved. A single hydrogen release container is connected to a hydrogen cylinder via a pipe, A plurality of single-type hydrogen release containers are arranged adjacent to each other, and an arbitrary number of combinations are detachably coupled by the attaching/detaching means, and a hydrogen gas inlet is connected to a hydrogen gas outlet of an adjacent single-type hydrogen release container. A flat hydrogen discharge container assembled and formed in a flat plate shape is arranged at the bottom of the bath, and hydrogen gas is flown from the single hydrogen discharge container to the adjacent single hydrogen discharge container. [Selection diagram] Figure 1
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