An image-capturing module for simplifying optical component and reducing assembly time includes a substrate unit, an image-capturing unit, a cover unit, a light-emitting unit and an optical imaging unit. The image-capturing unit has at least one image-capturing element electrically disposed on the substrate unit. The cover unit has at least one cover element disposed on the substrate unit and covering the image-capturing element, and the cover element has an opening for exposing the image-capturing element. The light-emitting unit has at least one light-emitting element electrically disposed on the substrate unit. The optical imaging unit has a light-guiding element disposed on the cover element for receiving light beams generated by the light-emitting element and an imaging element connected with the light-guiding element and disposed in the opening of the covering element. The light-guiding element and the imaging element are integrated with each other to form one piece.