A miniaturized lens assembly includes a first lens, a stop, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is made of plastic material, is a meniscus lens with negative refractive power, and includes a convex surface facing the object side. The second lens is made of plastic material and is a biconvex lens with positive refractive power. The third lens is made of glass material and is a biconvex lens with positive refractive power. The fourth lens is made of glass material, is a biconcave lens with negative refractive power, and is adhered to the third lens to form a compound lens. The fifth lens is made of plastic material, is provided with positive refractive power, and includes an aspheric surface.