Three-way stopcock, and liquid transfusion tubing set or blood transfusion tubing set using the three-way stopcock

摘要

A three-way stopcock, comprising: a substantially cylindrical shaped body (11) having three branch openings (121,122,123) on a periphery thereof; and a flow passage switching portion (15) that is mounted to the body so as to be rotatable with respect to the body and to have liquid-tightness, and has three flow passage openings (161,162,163) that form fluid flow passages (181,182) so as to allow communication between predetermined branch openings out of the respective three branch openings, wherein the fluid flow passages can be changed by rotating the flow passage switching portion with respect to the body.