To provide an oxygen concentrating apparatus capable of saving space while reducing manufacturing cost.SOLUTION: A flow path switching component 42, a backflow prevention component 35, 38 and a flow rate adjustment portion 43 are arranged on the downstream side flow path 50 of the oxygen concentration device 11 of the present invention. The flow path switching member 42 switches the communication path 41 connecting the adsorption cylinders 34, 37 to the open state or the closed state. The backflow prevention parts 35, 38 are provided for each of the adsorption cylinders 34, 37 to prevent backflow of the oxygen-enriched air. The flow rate adjustment unit 43 adjusts the flow rate of oxygen-enriched air flowing through the communication path 41. The oxygen concentrator 11 is provided with a manifold 61 integrally integrating all of the flow path changeover component 42, the backflow prevention components 35, 38 and the flow rate adjustment portion 43. The manifold 61 has a structure in which plate materials are stacked and has a flow path inside.BACKGROUND OF THE INVENTION【課題】製造コストを低減しつつ、省スペース化を図ることが可能な酸素濃縮装置を提供すること。【解決手段】本発明の酸素濃縮装置11の下流側流路50上には、流路切換部品42、逆流防止部品35,38及び流量調整部43が配置される。流路切換部品42は、吸着筒34,37間を繋ぐ連通路41を開状態または閉状態に切り替える。逆流防止部品35,38は、吸着筒34,37ごとに設けられ、酸素濃縮空気の逆流を防止する。流量調整部43は、連通路41を流れる酸素濃縮空気の流量を調整する。そして、酸素濃縮装置11は、流路切換部品42、逆流防止部品35,38及び流量調整部43の全てを一体集積化してなるマニホールド61を備える。マニホールド61は、板材を積層した構造を有し、かつ内部に流路を備える。【選択図】図1
