The present invention provides a glass lens for a lens module. The glass lens includes an optical portion having an optical axis, and an extending portion surrounding a periphery of the optical portion. The optical portion includes an object-side surface and an image-side surface opposite to the object-side surface, and the extending portion includes a first extending surface extending from the object-side surface towards a direction far away from the optical axis and a second extending surface extending from the image-side surface towards the direction far away from the optical axis. The first extending surface and the second extending surface are respectively provided with a first recess and a second recess filled with a black substance, and the second recess is closer to the optical axis with respect to the first recess.