Process cartridge and electrophotographic apparatus using the same

A process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge comprising an electrophotographic photosensitive member and a charging member,

• wherein the charging member includes a support having a conductive outer surface and a conductive layer provided on the outer surface of the support,
• the conductive layer has a matrix containing a first rubber and a plurality of domains dispersed in the matrix,
• the domain contains a second rubber and an electronic conductive agent,
• at least a part of domains is exposed to the outer surface of the charging member,
• the outer surface of the charging member is composed of at least the matrix and at least a part of domains,
• when a volume resistivity of the matrix is defined as Rcm and a volume resistivity of the domain is defined as Rcd, Rcm is 1.0×105 times or more of Rcd,
• an average value Sd of circle equivalent diameters of the domains observed on the outer surface of the charging member is 0.1 μm or more and 5.0 μm or less,
• the electrophotographic photosensitive member contains a support, a photosensitive layer, and a protective layer in this order,
• the protective layer contains a polymer of a composition containing a compound having a polymerizable group, and
• when a surface roughness of the protective layer is measured, a protruding valley portion Rvk is 0.01 μm or more and 0.10 μm or less and a load length ratio Mr2 is 75% or more and 85% or less, and
• Sd/Rvk is 1 or more and 100 or less.