Biological sample measurement device

A biological sample measurement device that measures a biological sample separated into a plurality of component regions, the biological sample measurement device comprising:

• a light source configured to irradiate the biological sample with light;
• an imaging device configured to generate a two-dimensional captured image of the biological sample by using the light transmitted through the biological sample;
• and
• an image processing unit configured to specify a target portion as a measurement target in the component region from the captured image,
• wherein the image processing unit specifies the target portion by using the captured image generated by using each of two wavelength components emitted by the light source,
• the light source is configured to irradiate at least two of the component regions with the light at a same time,
• the imaging device generates the captured image by using at least one of two or more exposure times or two or more gains, and
• the image processing unit selects, as an image of the biological sample to be used for the measurement, the captured image that can most clearly identify a boundary between the target portion and other portions by comparing the captured images generated by using the two or more exposure times or the two or more gains.