A lens according to the present invention comprises a lens body; an effective lens formed on the center of the lens body; a gate connected to one side of the lens body; and a linear section having a predetermined length formed on the outer peripheral surface and a connection unit of the gate of the lens body. The linear section is located on the location which is not interfered with the effective lens and a cutting surface which the gate is cut is disposed on the linear section arranged on both sides of the gate.
