An optical image stabilization OIS unit including a base; a holder module including an outer blade spaced apart from the base, a bobbin disposed in the outer blade, and a spring member connecting the bobbin and the outer blade; a first coil disposed on the bobbin; a magnet configured to move the bobbin by interacting with the first coil; a second coil configured to move the holder module by interacting with the magnet; a wire electrically connected with the first coil through the spring member; and a buffer unit connected with the wire, wherein the buffer unit has a curved shape having a curvature.