A lens comprising: a lens body, at least two connection portions including a stopper projecting from an edge of the lower surface of the lens body, and at least two reinforcement parts including a lower surface suitable to face a base plate when the lens is coupled to the base plate, wherein the stopper is suitable to contact an upper surface of the base plate, and the connection portion is suitable to fix the lens-body to the base plate by passing through the base plate when the lens is coupled to the base plate, wherein a lower part of the connection portion has a hook shape, and wherein the hook shape part of the connection portion contacts a lower surface of the base plate, the hook shape part of the connection portion is more distanced from the optical axis of the lens body than the stopper, and the stopper is arranged between the hook shape part of the connection portion and the optical axis of the lens body, and wherein the lens body is spaced apart from the base plate, wherein the lower part of the connection portion contacts the lower surface of the base plate at a first region, the stopper contacts the upper surface of the base plate at a second region, characterized in that the first region is not overlapped with the second region in a direction parallel to the optical axis, the second region is less distanced from a center of the lens than the first region, the reinforcement parts are suitable to contact a spacer, the reinforcement parts project outwardly from a side surface of the lens body and are spaced from the base plate by a predetermined distance, when the lens is coupled to the base plate, the at least two connection portions are separated from the at least two reinforcement parts, and a predetermined gap is provided between the at least two connection portions and the at least two reinforcement parts, and the at least two connection portions are disposed along a first axis, the at least two reinforcement parts are disposed along a second axis, the first axis is perpendicular to the second axis, and the first axis and the second axis are disposed in a same plane. a lens body, at least two connection portions including a stopper projecting from an edge of the lower surface of the lens body, and at least two reinforcement parts including a lower surface suitable to face a base plate when the lens is coupled to the base plate, wherein the stopper is suitable to contact an upper surface of the base plate, and the connection portion is suitable to fix the lens-body to the base plate by passing through the base plate when the lens is coupled to the base plate, wherein a lower part of the connection portion has a hook shape, and wherein the hook shape part of the connection portion contacts a lower surface of the base plate, the hook shape part of the connection portion is more distanced from the optical axis of the lens body than the stopper, and the stopper is arranged between the hook shape part of the connection portion and the optical axis of the lens body, and wherein the lens body is spaced apart from the base plate, wherein the lower part of the connection portion contacts the lower surface of the base plate at a first region, the stopper contacts the upper surface of the base plate at a second region, characterized in that the first region is not overlapped with the second region in a direction parallel to the optical axis, the second region is less distanced from a center of the lens than the first region, the reinforcement parts are suitable to contact a spacer, the reinforcement parts project outwardly from a side surface of the lens body and are spaced from the base plate by a predetermined distance, when the lens is coupled to the base plate, the at least two connection portions are separated from the at least two reinforcement parts, and a predetermined gap is provided between the at least two connection portions and the at least two reinforcement parts, and the at least two connection portions are disposed along a first axis, the at least two reinforcement parts are disposed along a second axis, the first axis is perpendicular to the second axis, and the first axis and the second axis are disposed in a same plane.