An imaging aid device aiding imaging of a predetermined region of a pearskin surface of an object having minute concave and convex portions and the predetermined region being subject to intense specular reflection, comprising: a light source unit that is configured to irradiate light; and a cover lid that has a shape to cover a predetermined region of a surface of the object, wherein a part of a surface of the cover lid corresponding to a predetermined angular range from a normal line direction directly opposing the predetermined region is a black surface region, and another surface of the cover lid corresponding to another angular range is made of a light-source surface diffusing and emitting light irradiated from the light source unit, and the cover lid comprises an upper portion facing the surface of the object; a side portion provided between the surface of the object and the upper portion and connecting the upper portion; and an imaging hole provided in the upper portion of the cover lid being configured to mount a camera at the imaging hole; wherein the light source unit is provided near the side of the upper portion of the side portion of the cover lid and the black surface region is provided on an inner surface of the upper portion according to a predetermined angular range from the normal line of the surface of the object, the imaging aid device being configured to determine the angular range of the black surface region of the cover lid so that a degree of separation of a brightness value of pixels in the predetermined region in an image obtained by imaging the pearskin surface of the object or a number of pixels having brightness equal to or below a predetermined threshold value becomes a predetermined value; and characterized in that the imaging aid device being further configured to determine the angular range of the black surface region for each article to be imaged, wherein the type of the article to be imaged is identified, without depending on individual items, by characteristic appearance of the article to be imaged, the appearance having a same pattern throughout items of the same article, and the imaging aid device comprises a mechanism to adjust the angular range of the black surface region, to a predetermined value determined to the type of the article. a light source unit that is configured to irradiate light; and a cover lid that has a shape to cover a predetermined region of a surface of the object, wherein a part of a surface of the cover lid corresponding to a predetermined angular range from a normal line direction directly opposing the predetermined region is a black surface region, and another surface of the cover lid corresponding to another angular range is made of a light-source surface diffusing and emitting light irradiated from the light source unit, and the cover lid comprises an upper portion facing the surface of the object; a side portion provided between the surface of the object and the upper portion and connecting the upper portion; and an imaging hole provided in the upper portion of the cover lid being configured to mount a camera at the imaging hole; wherein the light source unit is provided near the side of the upper portion of the side portion of the cover lid and the black surface region is provided on an inner surface of the upper portion according to a predetermined angular range from the normal line of the surface of the object, the imaging aid device being configured to determine the angular range of the black surface region of the cover lid so that a degree of separation of a brightness value of pixels in the predetermined region in an image obtained by imaging the pearskin surface of the object or a number of pixels having brightness equal to or below a predetermined threshold value becomes a predetermined value; and characterized in that the imaging aid device being further configured to determine the angular range of the black surface region for each article to be imaged, wherein the type of the article to be imaged is identified, without depending on individual items, by characteristic appearance of the article to be imaged, the appearance having a same pattern throughout items of the same article, and the imaging aid device comprises a mechanism to adjust the angular range of the black surface region, to a predetermined value determined to the type of the article.