An optical driving mechanism is provided, including a fixed portion, a movable portion and a driving assembly. The movable portion includes a holder and an optical element, wherein the holder is configured to sustain the optical element, and the optical element has a lens barrel and at least one lens. The driving assembly is configured to drive the movable portion to move relative to the fixed portion. A first connecting surface of the holder abuts a second connecting surface of the lens barrel, and at least one of the first connecting surface and the second connecting surface has a curved surface, wherein in the optical axis direction of the lens and in the direction perpendicular to the optical axis, the first connecting surface at least partially is overlapping the second connecting surface.