Patent ID: 8481167

Claim:
A charging member comprising: an electroconductive support; and an electroconductive elastic layer, wherein: the elastic layer is formed through irradiation of an electron beam onto a surface of a rubber layer consisting of a cross-linked product of a rubber mixture comprising an acrylonitrile-butadiene rubber and a styrene-butadiene rubber; the styrene-butadiene rubber has a 1,2-vinyl bond represented by the following formula (1), and at least one bond selected from a cis-1,4 bond represented by the following formula (2) and a trans-1,4 bond represented by the following formula (3); and a ratio of a sum of the numbers of moles of the cis-1,4 bond and the trans-1,4 bond to a total number of moles of the 1,2-vinyl bond, the cis-1,4 bond, and the trans-1,4 bond is 31 mol % or more and 61 mol % or less: