As an oxygen concentrator that reduces the difference in the flow rate of gas flowing through the pressure equalizing valve in the pressure equalizing path during the purge process and pressure equalizing process of the oxygen concentrating apparatus, it is in the opposite direction to the pressure loss of one flow of gas flowing through the pressure equalizing path A pressure control member having a difference in pressure loss depending on the flow direction is provided on at least one end side of the pressure equalizing valve so that the pressure loss of the flow is equal.酸素濃縮装置のパージ工程や均圧工程時に、均圧路の均圧弁を通って流れるガス流量差を低減させた酸素濃縮装置として、均圧路を流れるガスの一方の流れの圧力損失と逆方向の流れの圧力損失が同等になるように、均圧弁の少なくとも一端側に、流れ方向により圧力損失の差を有する圧力制御部材を備えたことを特徴とする酸素濃縮装置を提供する。
