An optical element driving mechanism is provided. The optical element driving mechanism includes a fixed part, a movable part, a first driving assembly, and a strengthening member. The fixed part includes a first base. The movable part is connected to an optical element with an optical axis. The movable part is movable relative to the fixed part, and the movable part is accommodated in the fixed part. The first driving assembly drives the movable part to move relative to the fixed part. The first driving assembly is disposed in the first base. The strengthening member is embedded in the first base. When viewed along a direction that is perpendicular to the optical axis, the strengthening member at least partially overlaps the first driving assembly. When viewed along the optical axis, the strengthening member does not overlap the first driving assembly.