Biological sample holding container and biological sample holding method

A biological sample holding container holding a biological sample with a film, the biological sample holding container comprising:

• a container main body having a bottom surface portion having a placement region for the biological sample and a side surface portion having a first end provided on the bottom surface portion so as to surround the placement region, the side surface portion having a second end opposite the first end;
• and
• an annular holding member insertable and removable inside the side surface portion,
• wherein the annular holding member holds the film covering the biological sample on the placement region with the bottom surface portion by being inserted inside the side surface portion together with the film, and
• wherein the film and the annular holding member are separate bodies, and
• wherein the annular holding member has a handle portion protruding beyond the second end of the side surface portion in a state of being inserted inside the side surface portion.