A developing cartridge , comprising: a cylindrical developing roller that develops, by way of a developer, an electrostatic latent image that is formed on an image bearing member ; a developer regulating member that regulates a thickness of developer carried on the developing roller ; and a frame that rotatably supports the developing roller , and supports the developer regulating member , wherein the frame has a developing roller support section (214a1) that rotatably supports an outer peripheral face (210d6) of at least one end of the developing roller , and the developing roller support section (214a1) is an integral part of the frame , and protrudes from the frame towards an inner side of the frame in the axial direction of the developing roller , characterized in that the developing roller support section (214a1) has a clearance at a position that, when viewed in an axial direction of the developing roller , overlaps a contact region at which the developing roller is in contact with the image bearing member , the developing cartridge further comprises a magnet member disposed in an inner section of the developing roller , a lubricant is interposed between the developing roller and the developing roller support section (214a1), and the developing roller support section (214a1) has a lubricant introduction section (214c3) in which another clearance that becomes gradually narrower, in a rotation direction (R) of the developing roller , as approaching a contact section with the outer peripheral face (210d6) of the developing roller , is formed between the developing roller support section (214a1) and the outer peripheral face (210d6) of the developing roller , the lubricant introduction section (214c3) being provided upstream of the contact section in the rotation direction (R). a cylindrical developing roller that develops, by way of a developer, an electrostatic latent image that is formed on an image bearing member ; a developer regulating member that regulates a thickness of developer carried on the developing roller ; and a frame that rotatably supports the developing roller , and supports the developer regulating member , wherein the frame has a developing roller support section (214a1) that rotatably supports an outer peripheral face (210d6) of at least one end of the developing roller , and the developing roller support section (214a1) is an integral part of the frame , and protrudes from the frame towards an inner side of the frame in the axial direction of the developing roller , characterized in that the developing roller support section (214a1) has a clearance at a position that, when viewed in an axial direction of the developing roller , overlaps a contact region at which the developing roller is in contact with the image bearing member , the developing cartridge further comprises a magnet member disposed in an inner section of the developing roller , a lubricant is interposed between the developing roller and the developing roller support section (214a1), and the developing roller support section (214a1) has a lubricant introduction section (214c3) in which another clearance that becomes gradually narrower, in a rotation direction (R) of the developing roller , as approaching a contact section with the outer peripheral face (210d6) of the developing roller , is formed between the developing roller support section (214a1) and the outer peripheral face (210d6) of the developing roller , the lubricant introduction section (214c3) being provided upstream of the contact section in the rotation direction (R). <EOS>