An optical imaging lens includes: a first, second, third and fourth lens element, the first lens element has an object-side surface with a convex part in a vicinity of the optical axis, the second lens element has an image-side surface with a concave part in a vicinity of its periphery; the third lens element has an image-side surface with a convex part in a vicinity of the optical axis, the fourth lens element has an object-side surface with a concave part in a vicinity of the optical axis; the fifth lens element has an object-side surface with a convex part in a vicinity of the optical axis, wherein the optical imaging lens set does not include any lens element with refractive power other than said first, second, third, fourth and fifth lens elements.