Liquid collecting apparatus and method

In the blood collecting apparatus 1 of the present invention, by pulling actively pushing blood through suction and discharge mechanism 5, the blood pressure by the physiological state of the animal can be bled faster decreases. Further, by providing the first flow path 2 and second flow path 3 having a predetermined length, the volume is prescribed length in advance has a known flow channel, the volumetric means the length and amount of collected blood (e.g., optical measurement means) without measuring in can be collected volume of provisions. Thus the blood collecting apparatus 1 can be miniaturized by the measuring means is not necessary, and installed in the vicinity of the animal, it is possible to reduce the dead volume. Furthermore, the blood flows to the fourth flow path 23 which is branched at the connection terminals 21, flowing a second flow path 3 branched connection terminal 6, the blood flowing in the second flow path 3 branched connection terminals 6 since collecting whichever is the highest priority, it is possible to collect the fresh blood from the collection source is a blood supply source.