A lens module capable of preventing a deterioration of optical properties and a method for manufacturing thereof are provided. Optical axes of lens portions of superimposed lens arrays are aligned. Substrate portions of the other lens arrays of the superimposed lens arrays except the lowermost lens array are cut by a first cutting portion. Subsequently, thermosetting resins are supplied from a gap between cut surfaces of the cut substrate portion so as to fill a gap between the substrate portions of the superimposed lens arrays with the thermosetting resins and to cause the thermosetting resins to integrally cover the cut surfaces of the substrate portion and a surface of the substrate portion of the uppermost lens array. Thereafter, the thermosetting resins are cured, and an individual lens module is separated by cutting the substrate portion of the lowermost lens array using a second cutting portion.