An optical imaging lens includes a first, second, third and fourth lens element, and an aperture stop positioned between the second and third lens elements. The first lens element has an object-side surface with a convex portion in a vicinity of its periphery, the second lens element has an image-side surface with a concave portion in a vicinity of the optical axis, the third lens element has an image-side surface with a convex portion in a vicinity of the optical axis, the fourth lens element is made of plastic and has an object-side surface with a concave portion in a vicinity of the optical axis, and the optical imaging lens set does not include any lens element with refractive power other than said first, second, third and fourth lens elements.