PURPOSE: To realize various inclined modes such as left foot-up, left foot-down, tiptoe-up, tiptoe-down or left foot-up and tiptoe-up and further for example inclined conditions different in an inclined angle even with the same left foot-up simple construction composed of first and second adjusting bodies pivotably lying one upon another and having the abutment surfaces of both bodies inclined.

CONSTITUTION: First and second adjusting bodies 3, 4 have the respective inclined surfaces laid connectively one upon another. When the highest part of the adjusting body 3 is placed opposed to the lowest one of the adjusting body 4, a base plate 1 provides a flat surface. When a handle 6 of the adjusting body 3 is rotated 180° so that the highest part of the adjusting body 3 is opposed to the highest part of the adjusting part 4, 8° left foot-down inclined state is provided. When both handle 6 of the adjusting body 3 and a handle 7 of the adjusting body 3 are rotated together, the highest part is moved and the composite inclined state such as left foot-up, left foot-down, tiptoe-up, tiptoe-down or left foot-up and tiptoe-up can be realized.