An imaging lens module has an optical axis, an object side and an image side. The imaging lens module includes a plastic barrel, an optical lens assembly, an image-side assembled element and a light blocking element assembly. The plastic barrel includes a first contacting surface, which is close to an image-side end of the plastic barrel. The image-side assembled element is disposed close to the image-side end of the plastic barrel. The image-side assembled element is in a tube shape and extends from the object side to the image side. The image-side assembled element includes a second contacting surface and an inner protruding portion, and the second contacting surface is disposed close to an object-side end of the image-side assembled element and correspondingly to the first contacting surface. The plastic barrel and the image-side assembled element contact each other via the first contacting surface and the second contacting surface.