An air compressor is provided. The air compressor includes a compression mechanism including a cylinder to generate compressed air, a motor provided to drive the compression mechanism, an inverter board including an inverter to control a rotation of the motor, two elongated tanks provided to store the compressed air generated by the cylinder, and a fan rotated by the motor to supply cooling air. The tanks are arranged below the cylinder and the motor, and the inverter board is arranged between the cylinder and the tanks.