Developing device, processing box and imaging device

The utility model relates to a developing device, a processing box and an imaging device. The utility model is characterized in that a scraper rear seal (87) with smaller elastic ratio and larger thickness is pasted on a scraper arranging part (46) and a sealing arrangement part (96), a sponge sealing member (92) with larger elastic ratio and smaller thickness is pasted on the opposite surface (98) of a roller of the sealing arrangement part (96), and the scraper rear seal (87) and the sponge sealing member (92) are pressed by using a plate spring component (57) of a scraper assembly (40). Under the state that the scraper rear seal (87) and the sponge sealing member (92) are pressed into the same thickness, the scraper rear seal (87) and the sponge sealing member (92) are clamped among the plate spring component (57), the scraper arranging part (46) and the sealing arrangement part (96).