An optical image stabilizer includes a main frame, a driving frame that moves in at least one direction within the main frame, a camera device is mounted on the driving frame, a pair of driving permanent magnets mounted on one of the main frame and the driving frame, a pair of coils mounted on the other of the main frame and the driving frame and faces the pair of driving permanent magnets, and at least one slidable bearing interposed between an inner sidewall of the main frame and an outer sidewall of the driving frame.