An inspection device for inspecting a state of a coating agent applied to a target surface having a protruding portion includes: an image capture device configured to capture an image of a predetermined inspection target region of the target surface; and an illumination device configured to emit light possible to be captured by the image capture device, toward the inspection target region, wherein the illumination device includes: a first light source configured to emit diffuse light toward an entirety of the inspection target region; and a second light source configured to emit direct light toward a shadow that is cast by the protruding portion due to emission of the diffuse light by the first light source.