A supporting device comprising a first member which supports a springy means for resiliently supporting a second member. The supporting device comprises a detection means for detecting displacement of the springy means with respect to the first member in accordance with the movement of the second member and a biasing means which applies a force to the springy means from the same direction as or from a direction opposite to that of the displacement for changing the elasticity of the springy means in accordance with the movement of the second member.