ELECTROPHOTOGRAPHY DEVICE DEVELOPMENT ROLL

Provided is an electrophotography device development roll in which an increase in the electric charge of a toner is suppressed. This electrophotography device development roll 10 is provided with a shaft 12, an elastic layer 14 formed on the outer circumference of the shaft 12, and a surface layer 16 formed on the outer circumference of the elastic layer 14. The surface layer 16 contains (a) to (c) below. (a) A binder comprising acrylonitrile-butadiene rubber having an acrylonitrile amount of 30 mass% or more; (b) an ion-conducting agent comprising at least one selected from a phosphonium saltand a pyridinium salt; and (c) an electric charge regulator comprising an acrylic polymer having a silicone group or fluorine-containing group and a cationic group. 本发明提供一种抑制调色剂的电荷上升的电子照相设备用显影辊。电子照相设备用显影辊10具备轴体12、形成于轴体12的外周的弹性体层14、以及形成于弹性体层14的外周的表层16，表层16含有下述的(a)～(c)：(a)由丙烯腈量为30质量％以上的丙烯腈-丁二烯橡胶构成的粘合剂；(b)由选自鏻盐以及吡啶鎓盐中的至少一种构成的离子导电剂；(c)由具有硅酮基或含氟基团、以及阳离子基团的丙烯酸系聚合物构成的电荷控制剂。