In addition to being possible, to verify the medicine which is accommodated without requiring troublesome job securely the fact that the substance which deteriorates the medicine arrives in the medicine accommodation interior is obstructed, the plurilocular bag which can prevent the deterioration of the medicine securely is offered. Two seat materials being connected, it is strong, the seal which demarcates the internal space section and the seat material exfoliation possibly being connected it has the cover seat of the pair which covers the medicine accommodation room in the plurilocular bag which stops having the bag itself where the weak seal section which is divided in the medicine accommodation room and the dilution liquid accommodation room was formed the internal space, each cover seat outside encircling the medicine accommodation room, forms the seal section to be connected by the seat material which opposes, the other cover seat absorption is formed the bad cause substance possibly, the inside edge of the outer part seal section is strong the seal sectionWith the inside edge, the communication section which makes the space with the seat material and the cover seat communicate which is on both sides is formed.煩雑な作業を要することなく収容した薬剤の確認を確実に行うことができる上に、薬剤を劣化させる物質が薬剤収容室内に到達するのを阻止し、薬剤の劣化を確実に防止することのできる複室バッグを提供する。二枚のシート材同士が接合されて内部空間を画定した強シール部と、シート材同士が剥離可能に接合されて内部空間を薬剤収容室及び希釈液収容室に区切る弱シール部とが形成されたバッグ本体を備えなる複室バッグにおいて、薬剤収容室を覆う一対のカバーシートを備え、各カバーシートは、薬剤収容室を包囲する外側シール部を形成する対向するシート材に接合され、他方のカバーシートが悪因物質を吸収可能に構成され、外側シール部の内側エッジと強シール部の内側エッジとの間に、両側にあるシート材とカバーシートとの間の空間を連通させる連通部が形成されている。
