A driving mechanism for driving an optical element is provided, including a housing, a holder movably disposed in the housing for receiving the optical element, a driving assembly, and a base. The housing has plastic material and a first joining structure. The driving assembly is disposed in the housing for driving the holder and the optical element to move relative to the housing. The base has a second joining structure. The first and second joining structures extend along the optical axis of the optical element, wherein the second joining structure forms a connection surface facing the optical axis and connected to the first joining structure.