A driving mechanism for driving an optical element is provided, including a housing module, a hollow holder, and an electromagnetic driving assembly. The holder is movably disposed in the housing module for holding the optical element, wherein the holder has a sidewall portion forming a through hole. The electromagnetic driving assembly includes a first magnetic element and a second magnetic element, wherein the first magnetic element is disposed on the holder and exposed to an inner side of the holder via the through hole, and the second magnetic element is connected to the housing module and corresponds to the first magnetic element to move the holder relative to the housing module.