PROBLEM TO BE SOLVED: To reduce an amount of generating medical waste, and to reduce a storage cost and a transportation cost.SOLUTION: The apparatus 1 for treating living body tissues includes: an openable sealed container 2 and comprising a rigid body material; an inner container 3 stored in the sealed container 2 and comprising a flexible material with which a pipe 5 connecting to a nozzle for sucking a living body tissue A is connected; a decompression means 4 for decompressing inside the inner container 3; and an expansion maintaining means 8 for keeping the inner container 3, wherein the inside thereof is decompressed by the decompression means 4, in an expanded state.【課題】医療廃棄物の発生量を低減し、収納コストや搬送コストを削減する。【解決手段】剛体材料からなる開閉可能な密閉容器2と、該密閉容器2内に収容され、生体組織Aを吸引するノズルに接続する配管5が接続された可撓性材料からなる内部容器3と、該内部容器3内を減圧する減圧手段4と、該減圧手段4により内部が減圧された内部容器3を拡張状態に維持する拡張維持手段8とを備える生体組織処理装置1を提供する。【選択図】図1