A novel protective agent supply device is provided including a protective agent block including a metal salt of a fatty acid; a rotatable foamed roller having a foamed layer having open cells, that is in continuous contact with both the protective agent block and an outer peripheral surface of an image bearing member that bears a toner image, and that scrapes the protective agent block and supplies the scraped protective agent to the outer peripheral surface of the image bearing member during rotation of the foamed roller; and a pressing unit that presses the protective agent block against the foamed roller.