In a drug container filled with a liquid drug, bubbles are formed during prolonged storage even in the case where the liquid drug is filled in a gas-free state after removing dissolved gas therefrom. To solve the problem, bubbles formed in the container during storage are removed and the formation of bubbles in the container is prevented. A drug container, in which a liquid drug is enclosed, provided at least in a part thereof with a resin member coming into contact with the liquid drug as described above, characterized in that a pressurizing member removable from the drug container, by which the liquid drug as described above is maintained in a pressurized state, is provided and the liquid drug as described above is filled in a substantially bubble-free state.
