The invention provides a lens module. The lens module comprises a lens cone, a first lens, a second lens and a shading sheet, wherein the first and second lenses and the shading sheet are contained in the lens cone; the lens cone comprises an object side and an image side opposite to the object side; the first lens is adjacent to the object side; the second lens is adjacent to the image side; the shading sheet spaces the first lens and the second lens, comprises a first surface facing the object side and a second surface facing the image side and is provided with an aperture running through the first and second surfaces; the aperture comprises an inner side; an oblique chamfer is arranged at the intersection of the first surface and the inner side and comprises an oblique plane; an included angle alpha facing the object side is formed between the oblique plane and the inner side and satisfies a conditional expression in the specification; in the conditional expression, I1 is the diameter of the aperture on the second surface; I2 is the diameter of the aperture on the first surface; X is the thickness of the shading sheet in the optical axis direction; and Z is the width of the inner side in the optical axis direction. The lens module has the following beneficial effect: reflected light streaks in the formed image are reduced by arranging the oblique chamfer on the shading sheet.