PROBLEM TO BE SOLVED: To provide a compact, lightweight oxygen concentrator in which the flow of cooling air for a compressor, or the primary heat source, is controlled to prevent recirculation of the cooling air for increased cooling efficiency and improved noise reduction.SOLUTION: An oxygen concentrator discharges air exhaustion from cooling means to the outside of an enclosure. The oxygen concentrator comprises: a cover 9 for covering a cylinder part of a compressor 2 a bulkhead in which an air intake port 11 of the cooling means is connected to a cooled air exhaustion opening part provided in the cover 9, and the air in the enclosure is sucked through the space between the cylinder and the cover, and which is used for separation from the other functional members and an exhaust chamber to connect to the ambient air.
