PROBLEM TO BE SOLVED: To provide an air supply device and an oxygen concentrator which can efficiently cool a driver board without reducing the efficiency of cooling compressors.SOLUTION: A driver board 150 forms a part of the wall surface of a fan case 131 and is disposed on the more upstream side of the wind generated by fans 132a, 132b than compressors 110. This makes it possible to expose the compressors 110 to the wind from the fans 132a and 132b without being blocked by the driver board 150. This also makes it possible to expose the driver board 150 to the wind from the fans 132a, 132b before the wind is warmed by the compressors 110. Consequently, the driver board 150 can be efficiently cooled without reducing the efficiency of cooling the compressors 110.
