An optical imaging lens includes a first lens element, a second lens element, an aperture stop, a third lens element, and a fourth lens elements arranged in sequence from an object side to an image side along an optical axis, and each lens element has an object-side surface and an image-side surface. The first lens element has negative refracting power. The object-side surface of the second lens element has a concave portion in a vicinity of the optical axis. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery of the fourth lens element.