This invention provides a concentrated-oxygen supplying apparatus which allows the compressed air to pass through the canister containing zeolite absorbent, and the apparatus comprising: (1)a pair of canisters for selectively absorbing the nitrogen in atmospheric air by zeolite adsorbent and then to produce oxygen； (2)a filter for filtering the atmospheric air to be used for producing compressed air； (3)a motor driving compressor for generating compressed air from the air filtered by said filter； (4)rechargeable butteries for supplying electric power for the apparatus including the motor of compressor； (5)a switching valve for alternately providing the compressed air of said two canisters； (6)a tank for storing the generated oxygen. The main housing of the apparatus comprises a cylinder and an air inlet, and the filter means and the compressing means, which has a motor for driving piston sealed in the channel of cylinder to move to and fro as a crank are constructed in one-piece molded style with the air inlet.本發明之目的在於提供一種氧氣濃縮裝置，係將壓縮空氣通過收放在筒體之沸石吸附劑中，並具備(1)一對吸附筒：用來以上述吸附劑選擇性地吸附氮氣而產生氧氣，(2)過濾機構：用以過濾上述製作壓縮空氣之原料空氣，(3)壓縮機構：其以馬達驅動，而由上述過濾機構所過濾之空氣製得上述壓縮空氣，(4)充電式電池：用以供應包含上述驅動馬達之電力，(5)轉換閥：能夠切換上述一對吸附筒以交替供應壓縮空氣，以及(6)容器：用以貯存上述產生之氧氣；其特徵為上述壓縮機構具備由汽缸室(以密封狀態引導被電動馬達驅動而依曲軸運動而往復動作之活塞)及空氣導入口形成之主機箱，並經由上述空氣導入口將上述過濾機構與上述壓縮機構一體化。
