This invention provides an imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with negative refractive power having a concave object-side surface and a convex image-side surface, both being aspheric; a fourth lens element with positive refractive power having a convex object-side surface, both its two surfaces being aspheric; and a stop disposed between the first and second lenses.