The present disclosure discloses an imaging lens assembly which includes, sequentially from an object side to an image side along an optical axis, a first lens to a fifth lens. The first lens has a positive refractive power and a convex object-side surface. The second lens has a negative refractive power, a concave object-side surface and a concave image-side surface. The third lens has a negative refractive power. The fourth lens has a positive or a negative refractive power. The fifth lens has a positive or a negative refractive power, a concave object-side surface, and an image-side surface of the fifth lens is a convex surface or a plane. An air spacing T23 between the second lens and the third lens on the optical axis and an air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: 1.0≤T23/T34