The present invention facilitates a healthy warm bath and half body bath, and penetrates the lower side of the tub and assembles it with a fitting [101], allowing the tub and the hot plate [200] to pass water well without leaking, and with a heating device and a hot plate. There is an adjusting bolt (223) to adjust the gap between the inside of the hot plate to form a concave-convex shape such as a round circle to increase the thermal conductivity, and the bottom of the bathtub is filled with a substance that emits far-infrared rays 'B' It has a shape and a thermometer is installed in the corner of the bathtub, and when the water temperature reaches the proper temperature, it has a health warm bath and half body bath, and the body emits far infrared rays, which is effective for health.
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