Abstract: A milking machine detects a flow rate of milk during milking and integrates by a completion timer the time when the detected flow rate is smaller than a reference flow rate near an end of the milking, the integrated time being displayed graphically. The reference flow rate is corrected by a specific resistance of milk. The specific resistance is obtained by selecting a minimum resistance value from resistance values of milk which are actually measured during a predetermined time interval starting from a time after milking begins when a flow rate of milk measured on the basis of a predetermined standard resistance value reaches a predetermined value.