A developing cartridge comprising: a casing (10;10A;10B;10E;10F) configured to accommodate developer therein; a storage medium (61;61A;61B;61D;61E;61F) including an electric contact surface (611;611 A;611 B;611 D;611 E;611F); an elastic member (73;75A;63B;62E;73F) extending in a first direction which crosses the electric contact surface (611;611 A;611 B;611 D;611E;611F), the elastic member (73;75A;63B;62E;73F) configured to be compressed or stretched in the first direction between a first state and a second state; a holder (62;62A;62B;62D;62E;62F) including an outer surface (620;620A) being positioned toward a side of the holder (62;62A;62B;62D;62E;62F) in the first direction, the electric contact surface (611;611A;611B;611D;611E;611F) being positioned at the outer surface (620;620A),the electric contact surface (611;611A;611 B;611 D;611 E;611F) being movable between a first position and a second position in the first direction relative to the casing (10;10A;10B;10E;10F); wherein a length of the elastic member (73;75A;63B;62E;73F) in the first direction is greater in the first state than in the second state, wherein the electric contact surface (611;611A;611B;611D;611E;611F) is in the first position in a state where the elastic member (73;75A;63B;62E;73F) is in the first state, wherein the electric contact surface (611;611 A;611 B;611D;611E;611F) is in the second position in a state where the elastic member (73;75A;63B;62E;73F) is in the second state, and characterized in that the outer surface includes: a third surface positioned at both sides of the electric contact surface in a third direction which is different from the first direction respectively; wherein the third surface is farther from the elastic member in the first direction than the electric contact surface . a casing (10;10A;10B;10E;10F) configured to accommodate developer therein; a storage medium (61;61A;61B;61D;61E;61F) including an electric contact surface (611;611 A;611 B;611 D;611 E;611F); an elastic member (73;75A;63B;62E;73F) extending in a first direction which crosses the electric contact surface (611;611 A;611 B;611 D;611E;611F), the elastic member (73;75A;63B;62E;73F) configured to be compressed or stretched in the first direction between a first state and a second state; a holder (62;62A;62B;62D;62E;62F) including an outer surface (620;620A) being positioned toward a side of the holder (62;62A;62B;62D;62E;62F) in the first direction, the electric contact surface (611;611A;611B;611D;611E;611F) being positioned at the outer surface (620;620A),the electric contact surface (611;611A;611 B;611 D;611 E;611F) being movable between a first position and a second position in the first direction relative to the casing (10;10A;10B;10E;10F); wherein a length of the elastic member (73;75A;63B;62E;73F) in the first direction is greater in the first state than in the second state, wherein the electric contact surface (611;611A;611B;611D;611E;611F) is in the first position in a state where the elastic member (73;75A;63B;62E;73F) is in the first state, wherein the electric contact surface (611;611 A;611 B;611D;611E;611F) is in the second position in a state where the elastic member (73;75A;63B;62E;73F) is in the second state, and characterized in that the outer surface includes: a third surface positioned at both sides of the electric contact surface in a third direction which is different from the first direction respectively; wherein the third surface is farther from the elastic member in the first direction than the electric contact surface . <EOS>