To enhance the metabolism of a user's body by promoting a perspiration effect, to make the user feel comfortable as sweat can be rapidly discharged and to enable the user to know the amount of perspiration and the components of the sweat by collecting the sweat.

The bed body 1 comprises a base 2 which is set lower on the rear side than the front side and a bed section 8 consisting of a pair of bed boards 9. The respective bed boards 9 are formed as slopes grading downward toward an inner edge 9B from an outer edge 9A in a transverse direction, and the bed section 8 has a top surface 8A constituting an approximately flat V shape. Also, the bed section 8 is formed as the slope grading downward toward a rear end 9D from a front end 9C. A sweat collection port 10 is formed at the center on the rear side of the bed body 1. A thermally insulating reflection sheet formed with a notched hole for outflow at a transverse center is laid on the bed section 8 and a warming-up device A for perspiration is placed on the bed body 1.