To provide a concentrated gas supply device and a concentrated gas supply method that can efficiently increase the concentration of a predetermined gas component in a room.SOLUTION: A concentrated gas supply device 10 comprises a gas concentrator 11 comprising intake parts 13 and 14 for taking air from the inside and outside of a room at the same time, a gas concentration part 15 for generating concentrated gas by increasing the concentration of a predetermined gas component from the air taken by the intake parts 13 and 14, and an air supply part 16 for supplying the generated concentrated gas to the inside of the room.SELECTED DRAWING: Figure 1【課題】室内における所定のガス成分の濃度を効率よく高めることができる濃縮ガス供給装置及び濃縮ガス供給方法を提供する。【解決手段】濃縮ガス供給装置１０は、室外と室内との双方から同時に空気を取り入れる取入部１３，１４と、取入部１３，１４によって取り入れられた空気から所定のガス成分の濃度を高めた濃縮ガスを生成するガス濃縮部１５と、生成した濃縮ガスを室内に給気する給気部１６と、を有するガス濃縮器１１を備えている。【選択図】図１
