An antireflective lens for infrared rays used in an infrared band, comprising: a lens base part comprising a base refractive material having a refractive index of 3.0 or greater; and an antireflective coating part formed on a front surface of the lens base part, wherein the antireflective coating part comprises: a first layer which is applied on a surface of the lens base part and which comprises a first refractive material having a refractive index less than the refractive index of the base refractive material; a second layer which is applied on a surface of the first layer and which comprises a second refractive material having a refractive index greater than the refractive index of the base refractive material; a third layer which is applied on a surface of the second layer and which includes a third refractive material having a refractive index corresponding to the refractive index of the first refractive material; and a fourth layer which is applied on a surface of the third layer and which includes a fourth refractive material having a refractive index less than the refractive index of the base refractive material and greater than the refractive index of the third refractive material, wherein the lens base part has a thickness of 3.5 to 4 mm, the first layer has a thickness of 0.405 to 0.495 μm, the second layer has a thickness of 0.144 to 0.176 μm, the third layer has a thickness of 1.35 to 1.65 μm, and the fourth layer has a thickness of 0.198 to 0.242 μm. a lens base part comprising a base refractive material having a refractive index of 3.0 or greater; and an antireflective coating part formed on a front surface of the lens base part, wherein the antireflective coating part comprises: a first layer which is applied on a surface of the lens base part and which comprises a first refractive material having a refractive index less than the refractive index of the base refractive material; a second layer which is applied on a surface of the first layer and which comprises a second refractive material having a refractive index greater than the refractive index of the base refractive material; a third layer which is applied on a surface of the second layer and which includes a third refractive material having a refractive index corresponding to the refractive index of the first refractive material; and a fourth layer which is applied on a surface of the third layer and which includes a fourth refractive material having a refractive index less than the refractive index of the base refractive material and greater than the refractive index of the third refractive material, wherein the lens base part has a thickness of 3.5 to 4 mm, the first layer has a thickness of 0.405 to 0.495 μm, the second layer has a thickness of 0.144 to 0.176 μm, the third layer has a thickness of 1.35 to 1.65 μm, and the fourth layer has a thickness of 0.198 to 0.242 μm. a first layer which is applied on a surface of the lens base part and which comprises a first refractive material having a refractive index less than the refractive index of the base refractive material; a second layer which is applied on a surface of the first layer and which comprises a second refractive material having a refractive index greater than the refractive index of the base refractive material; a third layer which is applied on a surface of the second layer and which includes a third refractive material having a refractive index corresponding to the refractive index of the first refractive material; and a fourth layer which is applied on a surface of the third layer and which includes a fourth refractive material having a refractive index less than the refractive index of the base refractive material and greater than the refractive index of the third refractive material, wherein the lens base part has a thickness of 3.5 to 4 mm, the first layer has a thickness of 0.405 to 0.495 μm, the second layer has a thickness of 0.144 to 0.176 μm, the third layer has a thickness of 1.35 to 1.65 μm, and the fourth layer has a thickness of 0.198 to 0.242 μm.