To provide a bathtub apparatus allowing a bather to continuously exercise.

The bathtub apparatus includes a bathtub, a first bathtub wall surface which is arranged in the bathtub and on which the bather can put his back, a second bathtub wall surface arranged opposed to the first bathtub wall surface, a foot resting section arranged on the second bathtub wall surface, a water discharging section which is arranged in the foot resting section and discharges jet flow, and a control section for controlling the jet flow discharged from the water discharging section, wherein the control section makes it possible to separate the sole of foot apart from the foot resting section by changing to a state that the jet flow is discharge when bringing the sole of the foot into contact with the foot resting section in the state that the jet flow is not discharged, and the contact with and separate from the foot rest section of the sole of the foot can be alternately repeated by the change of the water discharge of the jet flow.