A communication vessel communicating member for allowing the inside of the container body to communicate with the outside in a state in which it is fixed to the container body containing liquid, a valve (2) having an insertion hole (2a), a tubular body (3) carrying the valve (2), and a valve in the lumen of the tubular body In the vicinity of (2), there is a closed membrane (4) that closes the lumen, and the tubular body (3) and the closed membrane (4) are formed by one piece molding, and in one of the surfaces of the valve (2) side and the opposite surface of the closed membrane (4) in the closed membrane A groove (4a) passing through the heart is formed and a pair of ribs (4b) are formed on the opposite surface of the closed surface of the closed film (4) on which a groove is formed, and one rib of the pair of ribs is divided by a straight line passing through the center (x) of the closed membrane with the same longitudinal direction as the groove The other ribs are formed in one region of the two regions, and the other rib is formed in the other region.液体が入った容器本体に固定された状態で、容器本体内とその外とを連通させ得る医療用容器用連通部材であって、挿入孔(2a)を有した弁(2)と、弁(2)を担持する管状体(3)と、管状体(3)の内腔内の弁(2)の近傍において、内腔を閉鎖する閉鎖膜(4)とを含み、管状体(3)と閉鎖膜(4)は一体成形により成形されており、閉鎖膜(4)の弁(2)側の面およびその反対面のうちのいずれか一方に、閉鎖膜(4)の中心を通る溝(4a)が形成され、閉鎖膜(4)の溝が形成された面の反対面に1対のリブ(4b)が形成されており、1対のリブのうち一方のリブは、溝と長手方向が同じで閉鎖膜の中心(X)を通る直線によって分けられる2つの領域の一方の領域に形成され、他方のリブは他方の領域に形成されていることを特徴とする。
