PROBLEM TO BE SOLVED: To provide a medical resin container made perfect in the sealing functionality of a plug member by certainly preventing the rotation of the plug member mounted on a mouth part and made superior in sealing characteristics by the enhancement of the welding strength due to an increase in the opposed area of the plug member to the mouth part.SOLUTION: The medical resin container includes the plug member 4 fitted to and mounted on the mouth part 3 cylindrically protruded from a container body 2 so as to cover the mouth part 3. The rubber plug for sealing the mouth part 3 is allowed to closely fill the part along the top surface wall 7 in the plug member 4. The mouth part 3 and the plug member 4 are equipped with the rotation preventing fitting structure of the plug member 4 formed of the fitting projection 10 formed to the outer periphery of the mouth part 3 and the fitting hole part 11 formed to the inner periphery of the plug member 4. The top surface wall 7 of the plug member 4 is equipped with an opening means for exposing the rubber plug by a pull top 8.COPYRIGHT: (C)2012,JPO&INPIT【課題】口部に装着した栓体の回り阻止が確実に保持されて栓体の封止機能性が完全であるとともに、口部に対する栓体の対向面積の増大による溶着強度の向上により封止特性にすぐれた医療用樹脂容器を提供する。【解決手段】容器本体2より筒状に突出している口部3に被せて打ち込み装着する栓体4を備えている。栓体4内の天面壁7に沿った部分には口部3を封止するゴム栓が密に装填されている。口部3と栓体4は、口部3の外周に形成された嵌合凸部10と栓体4の内周に形成された嵌合孔部11とによる栓体4の回り止め嵌合構造を備えている。栓体4の天面壁7は、プルトップ8によりゴム栓を露出させる開封手段を備えている。【選択図】図1