A cartridge for an electrophotographic image forming apparatus, comprising: a housing configured to accommodate therein developer; a driving receiving part configured to receive a driving force; a first rotary member configured to rotate by a driving force transmitted from the driving receiving part; a conveyance member configured to rotate by a driving force transmitted from the first rotary member and configured to convey the developer; a second rotary member configured to rotate by a driving force transmitted from the driving receiving part; and a detected part configured to move by the rotation of the second rotary member, wherein the first rotary member and the second rotary member are configured to rotate about the same axis, and wherein the conveyance member is a first agitator configured to stir the developer, characterized by a second agitator configured to stir the developer; a third rotary member configured to transmit a driving force transmitted from the first rotary member to the first agitator; and a fourth rotary member configured to transmit a driving force from the driving receiving part to the first rotary member and to the second agitator, wherein the first rotary member is arranged between the fourth rotary member and the third rotary member in a driving force transmitting direction from the driving receiving part towards the third rotary member, wherein the fourth rotary member is configured to transmit a driving force from the driving receiving part to the second rotary member, wherein the first rotary member is configured to contact the fourth rotary member over an entire circumference thereof, wherein the second rotary member includes: a non-contact part configured not to contact the fourth rotary member when the second rotary member is rotated, and a contact part configured to contact the fourth rotary member when the second rotary member is rotated, and wherein the second rotary member is configured to move from a first position, at which the non-contact part faces the fourth rotary member in a diametrical direction of the second rotary member, to a second position, at which the contact part contacts the fourth rotary member and receives the driving force from the fourth rotary member. a housing configured to accommodate therein developer; a driving receiving part configured to receive a driving force; a first rotary member configured to rotate by a driving force transmitted from the driving receiving part; a conveyance member configured to rotate by a driving force transmitted from the first rotary member and configured to convey the developer; a second rotary member configured to rotate by a driving force transmitted from the driving receiving part; and a detected part configured to move by the rotation of the second rotary member, wherein the first rotary member and the second rotary member are configured to rotate about the same axis, and wherein the conveyance member is a first agitator configured to stir the developer, characterized by a second agitator configured to stir the developer; a third rotary member configured to transmit a driving force transmitted from the first rotary member to the first agitator; and a fourth rotary member configured to transmit a driving force from the driving receiving part to the first rotary member and to the second agitator, wherein the first rotary member is arranged between the fourth rotary member and the third rotary member in a driving force transmitting direction from the driving receiving part towards the third rotary member, wherein the fourth rotary member is configured to transmit a driving force from the driving receiving part to the second rotary member, wherein the first rotary member is configured to contact the fourth rotary member over an entire circumference thereof, wherein the second rotary member includes: a non-contact part configured not to contact the fourth rotary member when the second rotary member is rotated, and a contact part configured to contact the fourth rotary member a non-contact part configured not to contact the fourth rotary member when the second rotary member is rotated, and a contact part configured to contact the fourth rotary member when the second rotary member is rotated, and wherein the second rotary member is configured to move from a first position, at which the non-contact part faces the fourth rotary member in a diametrical direction of the second rotary member, to a second position, at which the contact part contacts the fourth rotary member and receives the driving force from the fourth rotary member.