PURPOSE: To obtain a supporting mechanism of a leaf springs where oscillation of movable bodies are suppressed by absorbing the kinematic energy for leaf spring resonance by a fixed body having viscoelastic bodies.

CONSTITUTION: A fixed body 21 has first viscoelastic bodies 22a, 22b, 23a, and 23b, and these viscoelastic bodies hold one end of leaf springs 4 and 5, which are provided with mobile bodies in the other end parts, between themselves while being prepressured, and leaf springs 4 and 5 are supported by the fixed body 21. Since leaf springs 4 and 5 are held between first viscoelastic bodies 22a, 22b, 23a, and 23b, the kinematic energy for oscillation of the leaf springs 4 and 5 is absorbed as the deformation energy of first viscoelastic bodies 22a, 22b, 23a, and 23b which are elastically deformed, and the oscillation of the leaf springs 4 and 5 is reduced by this absorption. Since first viscoelastic bodies 22a, 22b, 23a, and 23b hold flat springs 4 and 5 between themselves in the prepressured state, the absorption rate of the kinematic energy is raised. Thus, the supporting mechanism of the leaf springs where oscillation of the movable bodies is suppressed is obtained.