An exemplary process for making a light guide includes the steps of: providing a transparent base sheet; punching the base sheet to form an array of first apertures therein; coating a melted resin material in the first apertures and making the melted resin material fill up the first apertures; solidifying the melted resin material to form a plurality of resin blocks; punching the base sheet to form an array of second apertures in the resin blocks, the second apertures configured for illuminating the keys via at least one light source; and trimming the base sheet with the second apertures to form a light guide. A light guide made by the process is also provided.