A cartridge, comprising: a housing that has a developer accommodating portion configured to accommodate developer therein and that includes a first side wall and a second side wall, the first side wall and the second side wall being spaced apart from each other in a predetermined direction and opposing with each other in the predetermined direction, a from-first-to-second direction being defined along the predetermined direction as being directed from the first side wall to the second side wall; a coupling member configured to receive driving force from outside, the coupling member is disposed at a position opposite to the developer accommodating portion with respect to the first side wall; a detection body (82, 166, 181) for being detected by an external detecting unit (116, 171), the detection body is disposed at a position opposite to the developer accommodating portion with respect to the second side wall; a rotating member (80, 16, 27, 155) that is configured to rotate around a rotational axis (A2, A3, A4, A5) extending in the predetermined direction, at least part of the rotating member being disposed between the first and second side walls (36L, 36R); a first driving force transmission member (72, 62, 63, 156) configured to rotate together with the rotating member (80, 16, 27, 155) around the rotational axis (A2, A3, A4, A5), positioned at the same side with the coupling member with respect to the first side wall, and configured to transmit the driving force from the coupling member to the rotating member (80, 16, 27, 155); a second driving force transmission member (78, 141, 151, 147, 157, 183) configured to rotate together with the rotating member (80, 16, 27, 155) around the rotational axis (A2, A3, A4, A5), positioned at the same side with the detection body (82, 166, 181) with respect to the second side wall, and configured to transmit the driving force from the rotating member (80, 16, 27, 155) to the detection body (82, 166, 181); and a developing roller that is configured to carry developer thereon, characterized by a developing electrode that is positioned at the same side with the detection body with respect to the second side wall and that is configured to be electrically connected with the developing roller, wherein the developing electrode includes an electric-power receiving protrusion protruding from the developing electrode in a direction away from the second side wall (rightward direction) along the predetermined direction, the electric-power receiving protrusion being configured to be supplied with electric power from outside, and wherein the detection body is formed of an insulating material and is rotatably supported by the electric-power receiving protrusion. a housing that has a developer accommodating portion configured to accommodate developer therein and that includes a first side wall and a second side wall, the first side wall and the second side wall being spaced apart from each other in a predetermined direction and opposing with each other in the predetermined direction, a from-first-to-second direction being defined along the predetermined direction as being directed from the first side wall to the second side wall; a coupling member configured to receive driving force from outside, the coupling member is disposed at a position opposite to the developer accommodating portion with respect to the first side wall; a detection body (82, 166, 181) for being detected by an external detecting unit (116, 171), the detection body is disposed at a position opposite to the developer accommodating portion with respect to the second side wall; a rotating member (80, 16, 27, 155) that is configured to rotate around a rotational axis (A2, A3, A4, A5) extending in the predetermined direction, at least part of the rotating member being disposed between the first and second side walls (36L, 36R); a first driving force transmission member (72, 62, 63, 156) configured to rotate together with the rotating member (80, 16, 27, 155) around the rotational axis (A2, A3, A4, A5), positioned at the same side with the coupling member with respect to the first side wall, and configured to transmit the driving force from the coupling member to the rotating member (80, 16, 27, 155); a second driving force transmission member (78, 141, 151, 147, 157, 183) configured to rotate together with the rotating member (80, 16, 27, 155) around the rotational axis (A2, A3, A4, A5), positioned at the same side with the detection body (82, 166, 181) with respect to the second side wall, and configured to transmit the driving force from the rotating member (80, 16, 27, 155) to the detection body (82, 166, 181); and a developing roller that is configured to carry developer thereon, characterized by a developing electrode that is positioned at the same side with the detection body with respect to the second side wall and that is configured to be electrically connected with the developing roller, wherein the developing electrode includes an electric-power receiving protrusion protruding from the developing electrode in a direction away from the second side wall (rightward direction) along the predetermined direction, the electric-power receiving protrusion being configured to be supplied with electric power from outside, and wherein the detection body is formed of an insulating material and is rotatably supported by the electric-power receiving protrusion.