When dripping and collecting blood using this blood collection device, a liquid (L) is caused to fill a duct at an aspirating/discharging mechanism side, and a gas (G) is sandwiched in the duct between the liquid (L) filling the duct at the aspirating/discharging mechanism side and the blood that is the subject of collection. Also, the blood that is the subject of collection is aspirated by aspirating the gas (G) by means of aspirating the liquid (L) filing the duct at the aspirating/discharging mechanism side by means of the aspirating/discharging mechanism, and the gas (G) is pushed out and stopped at a dripping opening (8) by means of pushing out the liquid (L) filling the duct at the aspirating/discharging mechanism side by means of the aspirating/discharging mechanism, thus causing the blood (BL2) that is the subject of collection to drip. In such a manner, by stopping the gas (G) at the dripping opening (8), it is possible to cause an increase in the running out of liquid without the blood that is the subject of collection being retained, and it is possible to drip only the necessary quantity of collected blood without that which is other than the blood that is the subject of collection dripping and becoming mixed at the vessel (10) that is the dripping destination.Lors dun prélèvement sanguin effectué à laide du dispositif de prélèvement sanguin selon linvention, un liquide (L) remplit un canal découlement côté mécanisme daspiration et déjection, et un gaz (G) est introduit dans le canal découlement, entre le liquide (L) remplissant le canal découlement côté mécanisme daspiration et déjection et le sang prélevé. Ensuite, le liquide (L) dans le canal découlement côté mécanisme daspiration et déjection est aspiré par le mécanisme daspiration et déjection et par conséquent le gaz (G) est également aspiré, puis le sang prélevé. Ensuite le liquide (L) est contraint par le mécanisme daspiration et déjection et par conséquent le gaz (G) est également contraint puis
