To activate bath water by effectively processing it.

There are provided a bathtub body for storing therein bath water, a duct 4 mounted on the outside of the bathtub and communicated with the bathtub body through two openings 7a formed in the bathtub body and constituting a circulation passage for the bath water together with the bathtub body, a forced circulation apparatus provided in the course of the circulation passage for forcedly circulating the bath water in the circulation passage, a magnetic processing apparatus C provided in the course of the circulation passage for magnetically processing the bath water passing through thereinside, and a far infrared ray generator provided in the course of the circulation passage for irradiating the bath water passing thereinside with far infrared rays.