A chip package for optical sensing includes a substrate, and a semiconductor device positioned on the substrate and coupled to the substrate through a first conducting element. Two molding processes are applied, to form a first colloid body on the substrate so as to cover the semiconductor device and, on the first colloid body, to form a second colloid body which covers an optical device. The optical device is electrically connected to the substrate through a second conducting element. The light transmittance of the second colloid body exceeds that of the first colloid body.