PROBLEM TO BE SOLVED: To disclose an imaging optical lens in the field of an optical lens. From the object side to the image side, a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, and a positive refractive power are applied in this order. A fourth lens having a fourth lens, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, and a seventh lens having a negative refractive power are provided, and the focal distance of the fifth lens is f5, which is an imaging optical lens. The total focal distance is f, the number of abbes of the second lens is v2, the number of abbes of the third lens is v3, the radius of curvature of the surface of the fifth lens on the object side is R9, and the radius of curvature of the surface of the fifth lens on the image side. When is set to R10, -20.00 ≦ f5 / f ≦ −8.00, 2.80 ≦ v2 / v3 ≦ 4.50, -25.00 ≦ (R9 + R10) / (R9-R10) ≦ -14 Satisfy the relational expression of .00. The imaging optical lens of the present invention has good optical performance and satisfies the design requirements of large aperture, wide angle, and ultrathinness. [Selection diagram] Fig. 1
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