Abstract: A device which measures the amount of milk which has been milked by a combination of a swinging member 2 and a tank 5; and a weight balance section, thereby enhancing accuracy in measurement as well as reducing in size the device. A measuring method for total milk amount by using the measuring device and by measuring the amount of milk which is filled in the tank 5 and the amount of milk which does not flow into the tank 5 at the time of discharging with the rotational cycles of the swinging member 2 to thereby achieve a higher precision.