A charging member for being contactably disposed to an image bearing member and being supplied with a bias voltage includes a resistance layer having an ionic electrical conductivity. The resistance layer comprises a foamed elastic member and satisfies the following relationships:

B(5/3)A-0.3, and

B0.6,

wherein A represents a surface bubble-containing density measured, in a state that air bubbles are attached to the surface of said resistance layer, by immersion method according to JIS Z 8807; and B represents a surface bubble-deaerated density measured, in a state that said air bubbles are removed from the surface of said resistance layer, by immersion method according to JIS Z 8807.

 
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