DETENTION TYPE MEDICAL DEVICE

To provide a liquid medicine injection port capable of surely holding and fixing a plug body while reducing the number of components and man hour for assembly.SOLUTION: A liquid medicine injection port detained in a body is formed of: a base part including at least a part of a liquid storing part; a lid body covering the liquid storing part with the base part; and a septum part 20 being held from a vertical direction by the base part and the lid body, and receiving the liquid medicine stored in the liquid storing part. The septum part 20 has an upper surface 20b above the vertical direction and a lower surface 20c below the vertical direction. On the lower surface 20c, at least a part of an outer edge region Or of the lower surface 20c is a rough surface whose surface roughness is larger than that of an interior region Ir which is at inside of the outer edge region Or.SELECTED DRAWING: Figure 7 【課題】部品点数や組立て工数を抑えながら栓体を確実に保持、固定できる薬液注入ポートを提供する。【解決手段】体内に留置される薬液注入ポートを、液溜部の少なくとも一部を内包する基部と、基部と共に液溜部を覆う蓋体と、基部と蓋体とにより上下方向から挟持され、液溜部に貯留される薬液が供給される隔膜部２０とにより構成し、隔膜部２０を、上下方向の上方にある上面２０ｂと、上下方向の下方にある下面２０ｃとを有し、下面２０ｃにおいて、下面２０ｃの外縁領域Ｏｒの少なくとも一部を外縁領域Ｏｒよりも内側にある内側領域Ｉｒよりも表面粗さが大きい粗面とする。【選択図】図７