An image inspecting apparatus comprising: a first light illuminating unit configured to irradiate a measured object at a reading area on which an image is formed with light from an inclined direction; a second light illuminating unit configured to irradiate the measured object with light from a different direction; an imaging unit configured to receive specularly reflected light of the light with which the measured object is irradiated by the first light illuminating unit and reflected light of the second light illuminating unit; a first and a second reference plate (15A, 15B) disposed at the reading area having a mirror surface and a diffuse surface, respectively; and an image inspecting unit configured to inspect a gloss distribution of the image based on the amount of light received by the imaging unit and a correcting coefficient; wherein the image inspecting unit calculates the correcting coefficient based on a ratio of an amount of reflected light of illuminating light that is received by the imaging unit when the diffuse surface of the second reference plate is irradiated with the illuminating light from the first light illuminating unit to an amount of reflected light of illuminating light that is received by the imaging unit when the diffuse surface of the second reference plate is irradiated with the illuminating light from the second light illuminating unit, and the image inspecting unit inspects a gloss distribution of the image based on a value obtained by shading-correcting an amount of light obtained by subtracting an amount of reflected light of illuminating light that is received by the imaging unit when the measured object is irradiated with the illuminating light from the second light illuminating unit multiplied by the correcting coefficient, from an amount of reflected light of the illuminating light that is received by the imaging unit when the measured object is irradiated with the illuminating light from the first light illuminating unit, by using an amount of reflected light of illuminating light that is received by the imaging unit when the mirror surface of the first reference plate is irradiated with the illuminating light from the first light illuminating unit. a first light illuminating unit configured to irradiate a measured object at a reading area on which an image is formed with light from an inclined direction; a second light illuminating unit configured to irradiate the measured object with light from a different direction; an imaging unit configured to receive specularly reflected light of the light with which the measured object is irradiated by the first light illuminating unit and reflected light of the second light illuminating unit; a first and a second reference plate (15A, 15B) disposed at the reading area having a mirror surface and a diffuse surface, respectively; and an image inspecting unit configured to inspect a gloss distribution of the image based on the amount of light received by the imaging unit and a correcting coefficient; wherein the image inspecting unit calculates the correcting coefficient based on a ratio of an amount of reflected light of illuminating light that is received by the imaging unit when the diffuse surface of the second reference plate is irradiated with the illuminating light from the first light illuminating unit to an amount of reflected light of illuminating light that is received by the imaging unit when the diffuse surface of the second reference plate is irradiated with the illuminating light from the second light illuminating unit, and the image inspecting unit inspects a gloss distribution of the image based on a value obtained by shading-correcting an amount of light obtained by subtracting an amount of reflected light of illuminating light that is received by the imaging unit when the measured object is irradiated with the illuminating light from the second light illuminating unit multiplied by the correcting coefficient, from an amount of reflected light of the illuminating light that is received by the imaging unit when the measured object is irradiated with the illuminating light from the first light illuminating unit, by using an amount of reflected light of illuminating light that is received by the imaging unit when the mirror surface of the first reference plate is irradiated with the illuminating light from the first light illuminating unit.