A photosensitive unit is described. The photosensitive unit may include a side wall; a drum body rotatably provided with respect to the side wall and formed with an electrostatic latent image; a brake member provided on one end portion of the drum body in an axial direction and having a brake-side inclined surface whose diameter is gradually enlarged or reduced along the axial direction with an axis of the drum body as a center; and an urging member having an urging-side inclined surface surface-contacting the brake-side inclined surface and urging the brake member such that the urging-side inclined surface surface-contacts the brake-side inclined surface.