A CMOS image sensor and a method for fabricating the same is disclosed, to enhance the efficiency in condensing the light by forming a multi-layered micro lens with various materials having different refractive indexes, in which the CMOS image sensor includes a plurality of photosensitive devices on a semiconductor substrate; an insulating interlayer on the plurality of photosensitive devices; a plurality of color filter layers in correspondence with the respective photosensitive devices, to filter the light by respective wavelengths; a first micro-lens layer on an entire surface of the color filter layers, to condense the light; and a plurality of second micro-lens layers on the first micro-lens layer in correspondence with the respective photosensitive devices, wherein the second micro-lens layer has the different refractive index from that of the first micro-lens layer.