Developing roller, electrophotographic process cartridge, and electrophotographic image forming apparatus

A developing roller comprising an elastic layer and a surface layer, wherein;

• said surface layer has at least a nitrogen-atom-containing resin, organic-compound particles (M) and organic-compound particles (N),
• said organic-compound particles (N) are nitrogen-containing heterocyclic-compound particles,
• said the organic-compound particles (M) and the organic-compound particles (N) have a volume resistivity of 1.0×109 Ω·cm or more,
• a number-average particle diameter of said organic-compound particles (N) in said surface layer is smaller than a number-average particle diameter of said organic-compound particles (M) in said surface layer, and
• a universal hardness A (N/mm2) of the surface of said elastic layer and a universal hardness B (N/mm2) of the surface of said developing roller satisfy the relationship of the following expression:
• 0.9≦B/A≦1.8,
• where the universal hardness A (N/mm2) and the universal hardness B (N/mm2) are measured at an indentation depth of 40 μm in the vertical direction from the surface of the elastic layer and the surface of the developing roller, respectively.