An imaging lens module includes a plurality of lens elements, wherein one of the lens elements is a plastic lens element. At least one surface of an object-side surface and an image-side surface of the plastic lens element includes an effective optical portion, a first fitting portion and a connecting portion. The effective optical portion is aspheric. The first fitting portion surrounds the effective optical portion and is connected to another one of the lens elements adjacent to the surface for aligning the plastic lens element with the lens element adjacent to the surface. The connecting portion connects the effective optical portion and the first fitting portion, and includes a coating area and an isolation area. The coating area is coated with a light absorbing coating. The isolation area connects the coating area and the first fitting portion.