An optical disc drive includes an optical pickup unit and a carrying mechanism. The optical pickup unit has a first clamping portion and a second clamping part. The carrying mechanism includes a mounting plate, a first guiding component and a second guiding component. The mounting plate has a locking hole. At least one of the first guiding component and the second guiding component is a plate structure and has a hook. The hook is plugged into the locking hole for enabling the first guiding component or the second guiding component to be engaged with the mounting plate. The first clamping portion or the second clamping portion is respectively coupled to the first guiding component or the second guiding component for sliding the optical pickup unit along a first direction.