PROBLEM TO BE SOLVED: To provide an imaging optical lens. An imaging optical lens is, in order from the object side to the image side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a negative refraction. It is composed of a fourth lens with power, the focal distance of the first lens is f1, the focal distance of the second lens is f2, the focal distance of the fourth lens is f4, the radius of curvature of the object side surface of the fourth lens is R7, and the fourth. 4 When the radius of curvature of the image side surface of the lens is R8, the axial thickness of the first lens is d1, and the axial distance from the image side surface of the first lens to the object side surface of the second lens is d2, the conditional equation-0. .75 ≦ f1 / f2 ≦ −0.67, 0.32 ≦ f4 / f2 ≦ 0.40, 5.00 ≦ R7 / R8 ≦ 6.00, 1.40 ≦ d1 / d2 ≦ 3.20. The imaging optical lens according to the present invention has good optical performance and meets the design requirements for wide-angle and ultra-thinning. [Selection diagram] Fig. 1
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