To support stably toes at a natural angle in the height adjusted to one's figure by fixing a vertical rod part to a strut at an adjusted height and mounting a foot mounting bed to a horizontal rod to be pivoted forward and backward.

Screws 6a screwed in struts 2 erected on the rear horizontal side rod parts 13 of side rods 10 of a frame bed 1 are loosened to move up and down both side vertical rod parts 4 of a strut frame 5 inserted into the struts 2. After the height of a foot mounting bed 7 mounted pivotally to a horizontal rod 3 of the support frame 5 is adjusted to the hight position of the feet in which one feels most at ease under the condition of mounting the feet, the screws 6a are tightened to lock the tip on recesses 6b provided in the vertical rod parts 4 respectively and thereby fix the support frame 5. The height of the foot mounting bed 7 is adjusted to the height corresponding to one's figure to make one feel at rest, and the foot mounting bed device is disposed beneath a business desk or the like. The soles and toes of both feet are mounted on the foot mounting bed 7 which is pivoted by being held down with the toes and heels. An angle at which the toes are mounted is freely adjusted to one at which one feels at ease by mounting the feet.