Syringe

Abstract

Provided is a syringe including: a barrel; and a partitioning device, the partitioning device including: a cylindrical housing; and an inner plug, the housing including an engaging part configured to engage with the inner plug in an out-of-communication state, the inner plug including an engaged part configured to engage with the engaging part from a proximal side in the out-of-communication state, and the partitioning device being configured so that, when a pressing force is applied from the proximal side, one of the engaging part and the engaged part rides over an other one thereof and release engagement between the engaging part and the engaged part, thereby allowing the inner plug to have the proximal side space inside the housing and the distal side space inside the housing communicating with each other to achieve communication between the proximal side space inside the barrel and the distal side space inside the barrel.