To freely adjust the holding length of a crus part to conditions during medical thereby while keeping a patient using in stable attitude during medical thereby.

This medical crus holding device comprises an up-and-down expandable supporting bed 3 having a base fixed to a required size of base 2, a flat upper face and a front part provided with an inclined receiving and supporting face of front-down gradient, leg receiving and supporting mats 4 and 5 mounted on the supporting bed 3 at its upper face and inclined receiving and supporting face, separately, and a driving means 6 provided inside the supporting bed 3 for giving up-and-down moving operation to the supporting bed 3.