Disclosed herein is an imaging lens. The imaging lens according to a preferred embodiment of the present invention includes a first lens having positive (+) power and having both sides formed to be convex, a second lens having negative (−) power and formed to be concave toward a top side, a third lens having positive power and having both sides formed to be convex, a fourth lens having positive (+) power and formed to be convex toward a top side, and a fifth lens having negative (−) power and formed to be concave toward the top side, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are disposed in order from an object side.