An instrument driving device includes a magnet which rotates; a driving gear coaxial with the magnet; an output gear driven by the magnet; a needle pointer shaft which has a needle pointer mounted thereon and rotatably supports the output gear; a transmission gear which transmits rotation of the driving gear to the output gear; and a case which accommodates parts of the driving device elements, wherein a stopper and a bearing part which rotatably supports the needle pointer shaft are provided in the case, a protrusion which makes contact with the stopper is formed in the output gear, a contact point with which the needle pointer shaft makes contact is formed in the bearing part, and the end section at the protrusion side of the stopper is in the same position as the contact point in the axial direction of the needle pointer shaft.