Disclosed is a medical tube fixture that is excellent in liquid tightness between the outside of a body and the inside of the body and in which a seal member can be replaced. A skin fixing member (100) having a flange part (110) and a protrusion (120) and a medical tube holding mechanism part (200) for holding the medical tube (10) are provided. The protrusion (120) is provided with a recess (140). A female screw 145 is provided on the side wall surface of the recess 140, and the medical tube holding mechanism 200 is elastically deformed when a pressing force is applied in a state where the medical tube holding mechanism 200 is fitted to the recess 140. A sealing member 210 that is in close contact with the side wall surface of the concave portion 140, the bottom surface 142 of the concave portion 140, and the medical tube 10, and a male screw 221 that can be screwed into the female screw 145 formed in the concave portion 140. When the screw 221 is screwed into the female screw 145 and tightened, the seal member 210 has a seal member pressing body 220 that applies a pressing force to the seal member 210. 212 is formed. [Selection] Figure 1【課題】体外側と体内側との間の液密性に優れ、かつ、シール部材の交換が可能な医療用チューブ固定具を提供する。【解決手段】フランジ部１１０と突出体１２０とを有する皮膚固定部材１００と、医療用チューブ１０を保持する医療用チューブ保持機構部２００と、を備え、突出体１２０には、凹部１４０が設けられており、当該凹部１４０の側壁面には雌ネジ１４５が設けられており、医療用チューブ保持機構部２００は、凹部１４０に嵌合した状態で押圧力が付与されると弾性変形して凹部１４０の側壁面、当該凹部１４０の底面１４２及び医療用チューブ１０に対して密着するシール部材２１０と、凹部１４０に形成されている雌ネジ１４５に螺合可能な雄ネジ２２１を有し、当該雄ネジ２２１を雌ネジ１４５に螺合させて締め付けを行うと、シール部材２１０に押圧力を付与するシール部材押圧体２２０とを有し、シール部材２１０には切り込み部２１２が形成されている。【選択図】図１
