When a user is unaware of a fire, the discharge of oxygen cannot be stopped appropriately. In an oxygen concentrating device having an oxygen supply source, when oxygen from the oxygen supply source is supplied to the oxygen exhaust device, an attachment member to which the oxygen exhaust device is attached, On the inner side, a light receiving element 61 disposed on an extension line of the oxygen supply flow path 23 of the attachment member 22 is provided. [Selection] Figure 3【課題】使用者が火災に気付いていない場合には、適切に酸素の排出を停止させることができない。【解決手段】酸素供給源を有する酸素濃縮装置１０において、酸素供給源からの酸素が酸素排出器６８に供給されるときに、酸素排出器６８が取り付けられる取付け部材２２と、酸素濃縮装置１０の内側において、取付け部材２２の酸素供給流路２３の延長線上に配置された受光素子６１と、を備えた。【選択図】図３
