A fine positioning mechanism is provided in a disc drive for driving a head that records data onto and reproduces data from a disc. The mechanism includes a base fixed to an arm and a suspension, the base connecting the suspension to the arm, the arm swinging around a rotary shaft, and the suspension supporting the head. A drive part is located above the base, for deforming the base, the drive part including a shear type piezoelectric element that is polarized in a direction orthogonal to a thickness direction of the piezoelectric element, and deforms top and bottom surfaces of the piezoelectric element perpendicular to the thickness direction when voltage is applied to the piezoelectric element in the thickness direction.