Cartridge and image forming apparatus

An image forming apparatus comprising:

• an image bearing member operable to bear a developer image formed by development using a developer containing toner particles and specific particles, the specific particles having a smaller equivalent sphere diameter than the toner particles;
• an intermediate transfer member operable to bear the developer image transferred from the image bearing member;
• and
• a cleaning member having a contact portion that is operable to contact with the intermediate transfer member in a contact region and is operable to clean the surface of the intermediate transfer member, the cleaning member being configured to be able to retain the specific particles in the contact region,
• wherein the specific particles contain an organosilicon polymer having a partial structure represented by R—SiO3/2, wherein R represents an alkyl group having 1 to 6 carbon atoms, and the atomic concentration dSi of silicon in the specific particles satisfies the relationship 1.0 atomic % ≤dSi≤29.0 atomic %, when the total atomic concentration of silicon, oxygen, and carbon in the specific particles is measured to be 100.0 atomic % by electron spectroscopy for chemical analysis (ESCA), and
• wherein the specific particles satisfy L2/L3≤3/4 or L2/L3≥4/3 when assuming that the specific particles have three lengths L1, L2, and L3 in three axis directions in a three-dimensional coordinate system, wherein L1 is the longest one of the three lengths, in an average value of a unit volume.