A developing cartridge comprising: a photosensitive unit comprising a photosensitive drum ; a developing unit comprising a developing roller , and being connected to the photosensitive unit to rotate to a developing location, where the photosensitive drum and the developing roller contact each other to form a developing nip , and to rotate to a non-developing location, where the developing roller and the photosensitive drum are separate from each other to remove the developing nip ; and an elastic member configured to apply an elastic force to the developing unit and the photosensitive unit in a direction of rotating toward the developing location; characterised by comprising a nip control unit comprising: a nip separating portion switched to a nip forming location where the developing unit is located at the developing location and to a nip separating location where the developing unit is located at the non-developing location, a manipulation portion configured to switch the nip separating portion to the nip forming location and to the nip separating location by a manual manipulation, wherein the manipulation portion is exposed outside of the developing cartridge when the nip separation unit is located on the nip forming location, and a nip forming unit configured to switch the nip separating portion from the nip separating location to the nip forming location as the developing roller rotates. a photosensitive unit comprising a photosensitive drum ; a developing unit comprising a developing roller , and being connected to the photosensitive unit to rotate to a developing location, where the photosensitive drum and the developing roller contact each other to form a developing nip , and to rotate to a non-developing location, where the developing roller and the photosensitive drum are separate from each other to remove the developing nip ; and an elastic member configured to apply an elastic force to the developing unit and the photosensitive unit in a direction of rotating toward the developing location; characterised by comprising a nip control unit comprising: a nip separating portion switched to a nip forming location where the developing unit is located at the developing location and to a nip separating location where the developing unit is located at the non-developing location, a manipulation portion configured to switch the nip separating portion to the nip forming location and to the nip separating location by a manual manipulation, wherein the manipulation portion is exposed outside of the developing cartridge when the nip separation unit is located on the nip forming location, and a nip forming unit configured to switch the nip separating portion from the nip separating location to the nip forming location as the developing roller rotates. a nip separating portion switched to a nip forming location where the developing unit is located at the developing location and to a nip separating location where the developing unit is located at the non-developing location, a manipulation portion configured to switch the nip separating portion to the nip forming location and to the nip separating location by a manual manipulation, wherein the manipulation portion is exposed outside of the developing cartridge when the nip separation unit is located on the nip forming location, and a nip forming unit configured to switch the nip separating portion from the nip separating location to the nip forming location as the developing roller rotates. <EOS>