An image processing device for improving the storage quality of an edge portion while efficiently removing an isolated point is provided. The image processing device comprises an edge determining section for determining whether or not an edge exists in a predetermined area identified by a pixel of interest and the peripheral pixels of the pixel of interest, a difference calculating section for calculating the difference of the pixel value between the pixel of interest and the peripheral pixels in the predetermined area, a weight coefficient calculating section for calculating a weight coefficient for each of the peripheral pixels according to the result of the determination of the edge determining section from the difference calculated by the difference calculating section, a weighted average section for calculating the weighted average value of the peripheral pixels by using the weight coefficient calculated by the weight coefficient calculating section, and a correction section for correcting the pixel value of the pixel of interest at least one time on the basis of the weighted average value of the peripheral pixels calculated by the weighted average section, the pixel value ofthe pixel of interest, and the result of the determination of the edge determining section.