A liquid component collecting device capable of more easily collecting a liquid component.A liquid component collecting device (100) is provided with: a flexible tube-like liquid component storing container (21) having an opening at one end thereof a tube-like first housing container (22) for housing the liquid component storing container (21) and having an opening at one end thereof and a first cap (23) connected to the opening in the liquid component storing container (21) and fitted in the opening in the first housing container (22). A pressure regulating space (26) independent of the internal space within the liquid component storing container (21) is formed between the outer side of the liquid component storing container (21) and the inner side of the first housing container (22). The first cap (23) is provided with a liquid component introducing path (27) for introducing blood into the liquid component storing container (21), a first communication path (28) communicating with the internal space within the liquid component storing container (21), and a second communication path (29) communicating with the pressure regulating space (26).Linvention porte sur un dispositif de collecte de composant liquide apte à collecter plus facilement un composant liquide. Le dispositif de collecte de composant liquide (100) comporte : un contenant de stockage de composant liquide de type tube souple (21), comprenant une ouverture à une extrémité un premier contenant de boîtier de type tube (22) destiné à recevoir le contenant de stockage de composant liquide (21) et comportant une ouverture à une extrémité et un premier capuchon (23) relié à louverture du contenant de stockage de composant liquide (21) et ajusté dans louverture du contenant de boîtier (22). Un espace de régulation de pression (26) indépendant de lespace interne à lintérieur du contenant de stockage de composant liquide (21) est formé entre le côté extérieur du contenant de stockage de composant liquide (21
