An object of the invention is to provide a method for reinforcing a weak sealed portion of a multi-chamber medical container by simple processing. The method for reinforcing a weak sealed portion of a multi-chamber medical container according to the invention includes a multi-chamber container forming step for forming a multi-chamber medical container 10 including a first container portion 11 for containing medicine, a second container portion 12 for containing a medical solution, an empty container portion 13, a pair of lateral side strong sealed portions 16 for forming both side ends of the container portions, a medical solution side weak sealed portion 17 for forming a partition between the first container portion 11 and the second container portion 12, and a discharge side weak sealed portion 18 for forming a partition between the first container portion 11 and the empty container portion 13 and a weak sealed portion reinforcing step for bonding a reinforcement film 20 for reinforcing the discharge side weak sealed portion 18 so as to cover the surface of the first container portion 11 and so as to be spaced in the discharge direction 14 from a first border 19 with the first container portion 11 on the discharge side weak sealed porton 18.本發明係以提供藉簡易處理而補強醫療用多室容器之弱密封部的方法為目的。本發明之醫療用多室容器之弱密封部的補強方法,係具備下述步驟:製作醫療用多室容器10之多室容器製作步驟,該醫療用多室容器10係具有:用於收容藥劑之第1收容部11、用於收容藥液之第2收容部12、空收容部13、形成各收容部之兩側端部的一對之側部強密封部16、形成第1收容部11與第2收容部12之間之間隔壁的藥液側弱密封部17、及形成第1收容部11與空收容部13之間之間隔壁的排出側弱密封部18;以及弱密封部補強步驟,係將用於補強排出側弱密封部18之補強薄膜20,以被覆第1收容部11之表面的方式,且以在排出側弱密封部18自與第1收容部11之第1邊界緣19朝排出方向14隔著間隔的方式,進行黏著。10...醫療用多室容器11...第1收容部12...第2收容部13...空收容部14...排出方向15...寬度方向16...側部強密封部17...藥液側弱密封部18...排出側弱密封部19...第1邊界緣20...補強薄膜21...(第1收容部11與藥液側弱密封部17之)邊界緣22...(第1收容部11與側部強密封部16之)邊界緣26...周緣強密封部27...排出埠34...第2邊界緣37...(第2收容部12與藥液側弱密封部17之)邊界緣38...黏著部分30之排出方向14上游側端緣39...黏著部分30之排出方向14下游側端緣40...黏著部分31之排出方向34下游側端緣
