A sauna apparatus for a half-body bath including a body having a concave structure surrounded with a bottom surface located horizontally on the ground and at least three surfaces connected to the bottom surface. The sauna apparatus also includes a first heating part and a seat disposed at the inside thereof. The sauna apparatus further includes a cover connected on top of the body that is movable-up and down to open and close the interior of the body. The sauna apparatus also includes a second heating part in the cover and shock absorbers to connect the body and the cover with each other. In addition, the sauna apparatus includes a seat driving part to move the seat in an advancing or opposite direction.
