An image reading device is provided which can read an image at a wide dynamic range and which can be constructed at low cost. Film images which are recorded on a photographic film undergo a preliminary reading by an area CCD. On the basis of the image data obtained from the reading, the density of each LCD cell of an LCD when performing the main scanning of the image can be calculated so that the amount of incident light on the area CCD is as great as possible without saturation of the accumulated charge in each photoelectric conversion cell occurring. The film image then undergoes the main reading with the density of each LCD cell of the LCD controlled so as to be the above calculated density.