A wide-angle lens comprising: a first lens element L 1, a second lens element L 2, a third lens element L 3, an aperture diaphragm S, a fourth lens element L 4 and a fifth lens element L 5, arranged from an object plane to an image plane; the first lens element L 1 is a meniscus lens element having a negative focal power and protruding toward the object plane, the second lens element L 2 is a meniscus lens element having a negative focal power and protruding toward the object plane, the third lens element L 3 is a biconvex lens element having a positive focal power and protruding toward the image plane, the fourth lens element L 4 is a meniscus lens element having a negative focal power and protruding toward the object plane, and the fifth lens element L 5 is a lens element having a positive focal power; both sides of the first lens element L 1 are spherical surfaces; and, both sides of the second lens element L 2, both sides of the third lens element L 3, both sides of the fourth lens element L 4 and both sides of the fifth lens element L 5 are aspheric surfaces; and the wide-angle lens meets the following requirements: 0.91 < h 2 / r 2 < 0.95, 1.49 < n 1 < 1.59, 0.08 ≤ f / D ≤ 0.1, 54 ≤ ν 1 ≤ 65, and 193 ° < θ < 220 °, where h 2 is an image-side effective radius of the first lens element L 1, r 2 is an image-side curvature radius of the first lens element L 1, n 1 is a D-line refractive index of the first lens element L 1, f is a focal distance of the wide-angle lens, D is an optical length of the wide-angle lens calculated by adding the back focal distance bf to the distance of the optical axis from the first side of the object plane of the first lens element to last side of the image-side of the fifth lens element, v 1 is an Abbe number of the first lens element L 1, and θ is a viewing angle of the wide-angle lens. a first lens element L 1, a second lens element L 2, a third lens element L 3, an aperture diaphragm S, a fourth lens element L 4 and a fifth lens element L 5, arranged from an object plane to an image plane; the first lens element L 1 is a meniscus lens element having a negative focal power and protruding toward the object plane, the second lens element L 2 is a meniscus lens element having a negative focal power and protruding toward the object plane, the third lens element L 3 is a biconvex lens element having a positive focal power and protruding toward the image plane, the fourth lens element L 4 is a meniscus lens element having a negative focal power and protruding toward the object plane, and the fifth lens element L 5 is a lens element having a positive focal power; both sides of the first lens element L 1 are spherical surfaces; and, both sides of the second lens element L 2, both sides of the third lens element L 3, both sides of the fourth lens element L 4 and both sides of the fifth lens element L 5 are aspheric surfaces; and the wide-angle lens meets the following requirements: 0.91 < h 2 / r 2 < 0.95, 1.49 < n 1 < 1.59, 0.08 ≤ f / D ≤ 0.1, 54 ≤ ν 1 ≤ 65, and 193 ° < θ < 220 °, where h 2 is an image-side effective radius of the first lens element L 1, r 2 is an image-side curvature radius of the first lens element L 1, n 1 is a D-line refractive index of the first lens element L 1, f is a focal distance of the wide-angle lens, D is an optical length of the wide-angle lens calculated by adding the back focal distance bf to the distance of the optical axis from the first side of the object plane of the first lens element to last side of the image-side of the fifth lens element, v 1 is an Abbe number of the first lens element L 1, and θ is a viewing angle of the wide-angle lens.