The present invention provides an imaging lens assembly, comprising in order from an object side toward an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and an aperture stop positioned between an imaged object and the first lens element. The above lens arrangement shortens the total track length effectively, enabling a high performance imaging lens assembly with a wide field of view.