PROBLEM TO BE SOLVED: To cause a hub to reliably and efficiently assemble and hold a seal member.SOLUTION: A catheter assembly 10 includes a catheter 12, and a catheter hub 14. A hollow part 22 of the catheter hub 14 includes a hemostatic valve 24, a porous seal member 48, and a support member 50. The support member 50 includes: a hub mounting part 56 to be mounted on an inner peripheral surface of the catheter hub 14 constituting the hollow part 22 a first portion 54 inserted into the hemostatic valve 24 to apply friction force to the hemostatic valve 24 and a second portion 58 inserted in the seal member 48 to apply friction force to the seal member 48.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】シール部材をハブに確実且つ効率的に組付保持させる。【解決手段】カテーテル組立体10は、カテーテル12、カテーテルハブ14を備える。カテーテルハブ14の中空部22内には、止血弁24、多孔質性のシール部材48、支持部材50が設けられる。支持部材50は、中空部22を構成するカテーテルハブ14の内周面に取り付けられるハブ取付部56と、止血弁24内に挿入されて止血弁24に摩擦力を付与する第1部54と、シール部材48内に挿入されてシール部材48に摩擦力を付与する第2部58とを有する。【選択図】図3