The optical imaging lens includes, sequentially from an object side to an image side in order from an optical axis, first, second, third, fourth, and fifth lens elements. The first lens element is made of plastic. The object-side of the second lens element has a convex portion in a vicinity of the optical axis. The third lens element is made of plastic. The object-side surface of the fourth lens element has a concave portion in the vicinity of its periphery. The sum of thicknesses of all five lens elements along the optical axis is ALT, the distance between the image-side surface of the fifth lens element and an image plane along the optical axis is BFL, and the optical imaging lens satisfies the equation: 1.167≤ALT/BFL≤1.685.