Patent ID: 7835665

Claim:
A photosensitive unit comprising: a developer cartridge comprising a developing agent carrier that carries a developing agent and a casing that supports the developing agent carrier and accommodates the developing agent; a photosensitive member disposed so that the developing agent carrier is press-contacted to the photosensitive member, and in which an electrostatic latent image is developed by the developing agent supplied from the developing agent carrier; and a side wall to which the developer cartridge is detachably attached, wherein the casing is provided with a pivoting member, the pivoting member comprising a pressuring portion applied with an external pressing force and a fitting projection fitted to the side wall, and the pivoting member is configured to be pivoted along a pressing direction for pressing the developing agent carrier toward the photosensitive member when a pressing force is applied to the pressuring portion, or along a pressure releasing direction opposite to the pressing direction, and the side wall is formed with a fit portion in which the fitting projection is loosely received so that a movement of the fitting projection along a pivoting direction of the pivoting member is allowed.