Quality evaluation method and quality evaluation device

A quality evaluation device comprising:

• a light source that irradiates a cell mass with measurement light including near-infrared light;
• a light receiving unit that acquires spectral data related to the cell mass by receiving transmitted light or diffusely reflected light which is emitted from the cell mass by irradiation of the measurement light from the light source;
• and
• an analyzing unit that evaluates a quality of the cell mass, based on the spectral data received by the light receiving unit.