A process cartridge (B) has an image bearing member, a developing bias contact disposed at one longitudinal end of a developing means (12) near the image bearing member for applying the developing bias to the developing means (12), an earthing contact (18a) disposed at the same longitudinal end of the developing means remote from the image bearing member for earthing the image bearing member, and a charging bias contact for applying the charging bias to a charger means (10). The process cartridge (B) is mounted within a compact image forming apparatus which can obtain an image with high quality. According to the present invention, there are provided a process cartridge (B) and an image forming apparatus mountable such process cartridge therein, which can improve the reliability of the contactness of the contacts and can be made small-sized.