Abstract: Coaxial, two-cylindered air compressor, more specifically an air compressor capable of continuous air exhausting and air feeding, has a cylinder provided at either end of a main frame; to the underside of the main frame is extended a link so that serves to displace pistons in both cylinders, that by the provision of a crank pin both are fitted by articulation to the shaft side of a crank case, so as to facilitate engagement of the motor on top of the main frame with reduction gears on the upper side of the shaft lever by means of transmission gears on the shaft center, thereby setting the crank case to rotation, so that both of the cylinders may exhaust and suck air in a continuous manner, thereby reducing airfeeding, and airsucking time.