An imaging device 11, in which photoelectric conversion is performed by an imaging element 16 for acquiring an image of a subject formed by the photographing lens 12, comprising a light source estimation unit 31 for generating estimated light source information for estimating a light source of the subject, on the basis of an image signal acquired by the imaging device 16; an light source sensor 18 for detecting a spectrum of the light source; a light source sensor information calculation unit 32 for generating a light source sensor information including the spectrum based on the spectrum; a color conversion parameter calculation unit 33 for calculating the color conversion parameters of the image signal based on the estimated light source information and the light source sensor information; and, a color conversion processing unit 34 for performing color conversion of the image signal by using the color conversion parameters. This allows the imaging device to realize precise color reproduction with an improved accuracy.