A beverage container has a body having an inlet which is formed so as to penetrate the bottom of a receiving unit. A holder is coupled to the inlet to open and close the inlet upon ascending or descending with a nozzle of a beverage supply device being inserted into the holder. A locking member is coupled to the ascending/descending wall of the holder to allow the holder to close the inlet. The locking member has a plurality of elastic arms for elastically supporting the holder.