An imaging device proofed against ghosting and flaring in captured images includes a lens barrel and a lens module received in the lens barrel. The lens barrel comprises an inner surface and a supporting portion extending radially from the inner wall surface. The supporting portion has through hole for light entry, the through hole comprises a reflecting surface, the supporting portion comprises a top surface and a bottom surface, the reflecting surface connects the top surface and the bottom surface, and a plurality of light-scattering structures are formed on the reflecting surface.