Provided is a cell culturing vessel for holding and culturing cells. It has a first vessel that stores a culture medium and cells or only a culture medium, a second vessel that is placed above the first vessel and stores a culture medium and cells or only a culture medium, a main vessel that holds the first vessel and houses the second vessel, and a lid member that engages with the main vessel. The main vessel has a pressing member that fixes and holds the first vessel in the main vessel and the second vessel is eccentrically held in the first vessel by the pressing member.