<p><P>PROBLEM TO BE SOLVED: To improve a determination accuracy of a ripeness degree by focusing attention that there is a correlation between a chlorophyll absolute amount C and the ripeness in nondestructively determining the ripeness of fruit and vegetable products A. <P>SOLUTION: An apparatus 1 for determining the quality of fruit and vegetable products A according to the present invention is configured to apply light from a light projection part 3 to the fruit and vegetable products A, detect the transmission light by a light receiving part 4, and acquire at least an absorbance of a specific wavelength corresponding to a chlorophyll absorption band. This apparatus includes: storage means 11 for storing a relational expression Y or a map that is acquired by previously regressively analyzing a relationship between a secondary differential value d<SP POS="POST">2</SP>R/dλ<SP POS="POST">2</SP>of the absorbance of the specific wavelength and the
