Shading device, image reading device, and shading correction method

The invention provides a shading device, an image reading device, and a shading correction method. The shading device includes: a shading member to pass a conveying path for conveying a recoding medium to plural image reading sections and reach the plural image reading sections; and a moving member to move the shading member between the plural image reading sections and a retracted position on the outside of the conveying path.