A main object of the present invention is to provide a multi-structured drug-solution storing package having an inner bag which can restrain an elution of impurities to a drug solution. The object is attained by providing a drug solution-storing package comprising a main bag having an inner bag consisting of an inner layer film and an outer bag consisting of an outer layer film, and an extracting member, wherein the main bag has a multi-layer structure, the multi-layer structure being a structure where the inner bag and the outer bag are overlapped ； the inner bag and the outer bag have a part for heat-welding at which the multi-layer structure is welded in a state of one inner film and the other inner film are facing and overlapped ； the inner film which has a fluoro resin containing film whose melting point is 230℃ or less placed on an outermost surface of the drug solution side ； the outer film is a laminated film having a first outer film and a second outer film ； the first outer film is a film for heat-welding and is capable of heat-welding to the inner film, placed on a side of the inner bag ； and the second outer film is a film containing a resin whose melting point is same as the fluoro-containing resin of the inner film or higher, placed on an outer side of the main bag.本發明之主要目的在於提供一種具有可抑制雜質向藥液中溶出之內袋之多重構造的藥液收納用包裝袋。本發明之藥液收納用包裝袋具有：袋本體，其具有由內層膜構成之內袋、及由外層膜構成之外袋；及注出構件；上述內袋及上述外袋具有將重疊上述內層膜及上述外層膜而成之多層構造於使上述內層膜彼此對向重疊之狀態下呈熔接之熱熔接部，上述內層膜係於上述藥液側之最表面具有包含熔點為230℃以下之含氟樹脂之膜，上述外層膜係具有第1外層膜與第2外層膜之積層膜，上述第1外層膜係配置於上述內袋側且可與上述內層膜進行熱熔接之熱熔接用膜，且上述第2外層膜係配置於上述袋本體之外部側且包含具有與上述內層膜之上述含氟樹脂之熔點同等或其以上之熔點之樹脂的膜。
