An imaging lens assembly is disclosed in the present disclosure. The imaging lens assembly includes, in order from an object side to an image side: a stop; a first lens having a positive refractive power, a convex object-side surface and a convex image-side surface; a second lens having a negative refractive power and a convex and meniscus shaped image-side surface; a third lens having a positive refractive power, a convex object-side surface and a convex image-side surface; a fourth lens having a negative refractive power, an image-side surface being concave at a paraxial region and being convex and meniscus shaped at a peripheral region, and an object side-surface being convex at the paraxial region; the image-side surface of the fourth lens having an inflection point; at least one of the image-side surfaces of three lenses being spherical; and the imaging lens assembly satisfying following condition: 2.4