A portable electronic device and an image-capturing module thereof are provided. The image-capturing module includes a circuit substrate, an image sensing chip, a rigidity reinforcing structure, and a lens assembly. The circuit substrate has a plurality of conductive substrate contacts. The image sensing chip is disposed on the circuit substrate and electrically connected to the circuit substrate. The image sensing chip includes an image sensing region, and a plurality of conductive chip contacts respectively and electrically connected to the conductive substrate contacts. The rigidity reinforcing structure is disposed on the circuit substrate. The lens assembly includes a lens holder and a lens structure disposed on the lens holder, and the lens structure corresponds to the image sensing region. A perpendicular projection of each of the conductive substrate contacts and a perpendicular projection of each of the conductive chip contacts can be shown on the rigidity reinforcing structure.