Process cartridge and electrophotographic apparatus capable of suppressing lateral running while maintaining satisfactory potential function

A process cartridge comprising:

• an electrophotographic photosensitive member;
• and
• a charging member,
• the process cartridge being removably mounted onto a main body of an electrophotographic apparatus,
• wherein the electrophotographic photosensitive member includes a first support having a cylindrical shape, a lowermost layer formed immediately on the first support, and a photosensitive layer formed on the lowermost layer,
• wherein the charging member is an electrophotographic charging member including a second support having a columnar shape and a second conductive layer formed on the second support,
• wherein the second conductive layer includes a matrix containing a first rubber and a plurality of domains dispersed in the matrix,
• wherein the plurality of domains each contain a second rubber and an electron conductive agent,
• wherein the matrix has a volume resistivity ρM that is 1.0×105 times or more as large as a volume resistivity ρD of each of the plurality of domains, and
• wherein, in a case where a maximum frequency at which a phase of an impedance reaches 45°, when the impedance is measured by applying an AC voltage to the lowermost layer while changing the AC voltage at a frequency within a range of from 1.0×10−2 (Hz) to 1.0×106 (Hz), is represented by fOPC (Hz), and in a case where a maximum frequency at which a phase of an impedance reaches 45°, when the impedance is measured by applying an AC voltage to the charging member while changing the AC voltage at a frequency within a range of from 1.0×10−2 (Hz) to 1.0×106 (Hz), is represented by fC (Hz), the fOPC and the fC satisfy a relationship of one of the following expression (D1) and the following expression (D2):
• 10≤fOPC/fC≤10,000 Expression (D1)
• 0.0001≤fOPC/fC≤0.1 Expression (D2).