A suction drain device 5 of a disclosed liquid collecting apparatus 1 actively pushes and pulls blood. This achieves liquid collection at high speed even under decreased pressure depending on a physiological state of an animal. Moreover, the liquid collecting apparatus 1 includes a first flow path 2 and a second flow path 3 having a given length. Accordingly, the flow path with a given length set in advance and thus a known volume allows collection of a given amount volume of blood without measuring a length and an amount of blood using a volume measuring device. Accordingly, no need of the measuring device allows reduction in size of the liquid collecting apparatus 1. Consequently, the liquid collecting apparatus 1 can be installed adjacent to the animal to achieve reduction in dead volume. Moreover, blood is flown to a fourth flow path 23 branched with a connecting terminal 21, and is also flown to the second flow path 3 branched with a connecting terminal 6. The blood flown in the second flow path 3 is collected at the highest priority. This obtains collection of fresh blood from a collecting source as a blood supply source.
