A decanter for bottled wine includes a main body having a first end, a second end, a bottle mouth insertion portion, an accommodating chamber and a wine guide portion, an outer cylinder covering the main body and a rotary shaft. At least one retaining ring is provided on an outer wall of the bottle mouth insertion portion. A bottom of the accommodating chamber has a plurality of equally spaced first through, protruding posts each having a second through hole, and an inner shaft seat. An inner end of the rotary shaft is pivotally connected to the inner shaft seat. The wine guide portion is disposed inside the second end of the main body and located at an outer end of the accommodating chamber. The wine guide portion includes an outer shaft seat for pivotally connecting an outer end of the rotary shaft and a plurality of wine guide holes.