PROBLEM TO BE SOLVED: To provide a cell cryopreservation container which is unlikely to be broken in housing a cell or in the use under an environment at an ultra-low temperature.SOLUTION: A cell cryopreservation container 1 is configured by welding a peripheral edge part of a first sheet-like member 40 of a resin and a peripheral edge part of a second sheet-like member 50 of a resin. The first sheet-like member 40 includes a first flat wall part 41 of a plane shape, a first end wall part 42 which bends and extends from a peripheral edge of the first flat wall part 41, and a first outer edge part 43 which bends and extends outward from an end part of the first end wall part 42. The first end wall part 42 includes a flat wall side inclination part 421 which is located on the side of the first flat wall part 41, an outer edge side inclination part 422 which is located on the side of the first outer edge part 43, and a gradual inclination part 423 which is located between the flat wall side inclination part 421 and the outer edge side inclination part 422 and has an inclination more gradual than the inclination of the flat wall side inclination part 421 and the outer edge side inclination part 422.COPYRIGHT: (C)2015,JPO&INPIT【課題】細胞収容時や、超低温の環境下で使用した場合に破損しにくい細胞凍結保存容器を目的とする。【解決手段】樹脂製の第1シート状部材40の周縁部と、樹脂製の第2シート状部材50の周縁部とが溶着されて構成された細胞凍結保存容器1であって、第1シート状部材40は、平面状の第1平壁部41と、第1平壁部41の周縁から屈曲して延びる第1端壁部42と、第1端壁部42の端部から屈曲して外側に延びる第1外縁部43と、を備え、第1端壁部42は、第1平壁部41側に位置する平壁側傾斜部421と、第1外縁部43側に位置する外縁側傾斜部422と、平壁側傾斜部421と外縁側傾斜部422との間に位置し、平壁側傾斜部421及び外縁側傾斜部422よりも傾斜のゆるい緩傾斜部423と、を備える。【選択図】図4
