To provide a device for supporting the motions of legs for turning over in bed.

Cloth belts 14R and 14L to be fitted on the calves are bridged over sliders 12R and 12L, and the sliders 12R and 12L are held on slide guides 11R and 11L to be freely slid in the direction of the axis and to be freely rotated around this axis. The slide guides 11R and 11L are bonded to a turning arm 21 of a turning unit 20, and the relevant turning arm 21 is turned around an axis parallel with a Y axis with a rotating motor 23 as a driving source. The turning unit 20 is moved up and down (in a direction Z) by a feed screw mechanism with a vertical motor 32 of a vertical moving unit 30 as a driving source. The vertical moving unit 30 is moved horizontally from side to side (in the direction X) by a feed screw mechanism with a horizontal motor 42 of a horizontal moving unit 40 as a driving source.