A color adjustment apparatus (1, 4) that adjusts color of a color image represented by an image signal, comprising: a storage section that stores parameters including a lower limit value S1 and an upper limit value S3 of saturation to be adjusted, a value S2 between S1 to S3 indicating a value of saturation to be adjusted the most-, and a saturation Se after color adjustment in a case where the saturation before color adjustment is equal to S2; a hue acquiring section that acquires the hue of each pixel forming the color image, from the image signal; a saturation correspondence value calculating section that calculates the saturation S_in before color adjustment of each pixel forming the color image, from the image signal; a saturation adjusting section that calculates the saturation S_out after color adjustment corresponding to the saturation S_in before color adjustment calculated by the saturation correspondence value calculating section, based on the parameters; and an image signal generating section that generates an image signal representing a color image in which the color has been adjusted, according to the saturation S_out after color adjustment calculated by the saturation adjusting section, wherein the saturation adjusting section (i) increases S_in in the range from S1 to S2 such that the adjustment amount increases as S_in increases, and increases S_in in the range from S2 to S3 such that the adjustment amount decreases as S_in increases, or (ii) decreases S_in in the range from S1 to S2 such that the adjustment amount increases as S_in increases, and decreases S_in in the range from S2 to S3 such that the adjustment amount decreases as S_in increases-, characterized in that: the storage section stores the parameters in association with each of a plurality of hue ranges, the color adjustment apparatus (1, 4) further comprises: a parameter reading section that reads the parameters associated with the hue acquired by the hue acquiring section from among parameters stored in the storage section, and the saturation adjusting section performs calculation based on the parameters read by the parameter reading section. a storage section that stores parameters including a lower limit value S1 and an upper limit value S3 of saturation to be adjusted, a value S2 between S1 to S3 indicating a value of saturation to be adjusted the most-, and a saturation Se after color adjustment in a case where the saturation before color adjustment is equal to S2; a hue acquiring section that acquires the hue of each pixel forming the color image, from the image signal; a saturation correspondence value calculating section that calculates the saturation S_in before color adjustment of each pixel forming the color image, from the image signal; a saturation adjusting section that calculates the saturation S_out after color adjustment corresponding to the saturation S_in before color adjustment calculated by the saturation correspondence value calculating section, based on the parameters; and an image signal generating section that generates an image signal representing a color image in which the color has been adjusted, according to the saturation S_out after color adjustment calculated by the saturation adjusting section, wherein the saturation adjusting section (i) increases S_in in the range from S1 to S2 such that the adjustment amount increases as S_in increases, and increases S_in in the range from S2 to S3 such that the adjustment amount decreases as S_in increases, or (ii) decreases S_in in the range from S1 to S2 such that the adjustment amount increases as S_in increases, and decreases S_in in the range from S2 to S3 such that the adjustment amount decreases as S_in increases-, (i) increases S_in in the range from S1 to S2 such that the adjustment amount increases as S_in increases, and increases S_in in the range from S2 to S3 such that the adjustment amount decreases as S_in increases, or (ii) decreases S_in in the range from S1 to S2 such that the adjustment amount increases as S_in increases, and decreases S_in in the range from S2 to S3 such that the adjustment amount decreases as S_in increases-, characterized in that: the storage section stores the parameters in association with each of a plurality of hue ranges, the color adjustment apparatus (1, 4) further comprises: a parameter reading section that reads the parameters associated with the hue acquired by the hue acquiring section from among parameters stored in the storage section, and the saturation adjusting section performs calculation based on the parameters read by the parameter reading section. the storage section stores the parameters in association with each of a plurality of hue ranges, the color adjustment apparatus (1, 4) further comprises: a parameter reading section that reads the parameters associated with the hue acquired by the hue acquiring section from among parameters stored in the storage section, and the saturation adjusting section performs calculation based on the parameters read by the parameter reading section.