A spindle motor is disclosed, wherein a spindle motor includes a rotating shaft coupling to a rotor yoke for supporting an optical disc, a clamp case disposing on the rotor yoke and coupling to the rotating shaft; and a chucking member including a rim portion combined with the clamp case, a plurality of extension portion radically extruded from an edge portion of the rim portion, and chucking arm portions formed at each of the end portion of the extension portions to chuck an inner face of the optical disc.