An optical scanning device, comprising: a substrate including a substrate main body and two cantilever beam portions which protrude from both side portions of the substrate main body; a drive source formed by a piezoelectric film provided on the substrate main body; torsion bar portions provided between the cantilever beam portions so as to support a mirror portion from both sides thereof, the torsion bar portions extending in a perpendicular direction relative to an axial direction of the cantilever beam portions; and a supporting component which fixes a fixed end portion of the substrate main body which is on the opposite side thereof from the mirror portion side, wherein the drive source is configured to generate substrate vibration and placed at a position away from the connecting positions where the torsion bar portions which support the mirror portion connect to the cantilever beam portions, wherein the mirror portion resonates and vibrates in accordance with a vibration imparted to the substrate by the drive source characterized in that the drive source is positioned such that a minimum amplitude of substrate vibration is obtained in the connecting positions where the torsion bar portions which support the mirror portion connect to the cantilever beam portions, connecting portions between the cantilever beam portions and the substrate main body are positioned in the maximum amplitude of the substrate vibration which is generated in the substrate main body by the drive source, and a distance between the minimum amplitude of the substrate vibration and the connecting portions is less than or equal to 1/4 of a wavelength of said substrate vibration. a substrate including a substrate main body and two cantilever beam portions which protrude from both side portions of the substrate main body; a drive source formed by a piezoelectric film provided on the substrate main body; torsion bar portions provided between the cantilever beam portions so as to support a mirror portion from both sides thereof, the torsion bar portions extending in a perpendicular direction relative to an axial direction of the cantilever beam portions; and a supporting component which fixes a fixed end portion of the substrate main body which is on the opposite side thereof from the mirror portion side, wherein the drive source is configured to generate substrate vibration and placed at a position away from the connecting positions where the torsion bar portions which support the mirror portion connect to the cantilever beam portions, wherein the mirror portion resonates and vibrates in accordance with a vibration imparted to the substrate by the drive source characterized in that the drive source is positioned such that a minimum amplitude of substrate vibration is obtained in the connecting positions where the torsion bar portions which support the mirror portion connect to the cantilever beam portions, connecting portions between the cantilever beam portions and the substrate main body are positioned in the maximum amplitude of the substrate vibration which is generated in the substrate main body by the drive source, and a distance between the minimum amplitude of the substrate vibration and the connecting portions is less than or equal to 1/4 of a wavelength of said substrate vibration.