A toner container comprising: a case main body containing developer; a rotator (55, 56) rotatably arranged between a pair of sidewalls (43F, 43B) of the case main body, the pair of sidewalls (43F, 43B) being opposed to each other; a coupling coupled to the rotator (55, 56) with at least one sidewall of the pair of sidewalls (43F, 43B) in between; and a holder protruding on an inner face of at least the one side wall in between the coupling and the rotator (55, 56) and holding an end in an axis direction of the rotator (55, 56) at a position where the end is capable of coupling to the coupling, wherein the rotator (55, 56) is included in an agitator which agitates the developer contained in the case main body, wherein the agitator includes: an agitating rotation shaft rotatably supported around an axis in the case main body; and an agitating blade fixed along a longitudinal direction of the agitating rotation shaft, wherein the rotator (55, 56) includes the agitating rotation shaft or both of the agitating rotation shaft and the agitating blade, wherein the case main body includes: a storing case including the sidewalls (43F, 43B) erected around a bottom of the storing case, the storing case having an opened upper face; and a lid sealing the upper face of the storing case, and the storing case and the holder are integrally formed, and wherein the rotator (55, 56) includes a flange extending to a radial direction at the end in the axis direction of the rotator (55, 56), and characterized in that the holder includes: a pair of left and right ribs extending in upper and lower direction; and a bridge arranged between upper ends of the pair of left and right ribs and curved so as to project downward, and the flange is formed in a disk shape and held by the bridge. a case main body containing developer; a rotator (55, 56) rotatably arranged between a pair of sidewalls (43F, 43B) of the case main body, the pair of sidewalls (43F, 43B) being opposed to each other; a coupling coupled to the rotator (55, 56) with at least one sidewall of the pair of sidewalls (43F, 43B) in between; and a holder protruding on an inner face of at least the one side wall in between the coupling and the rotator (55, 56) and holding an end in an axis direction of the rotator (55, 56) at a position where the end is capable of coupling to the coupling, wherein the rotator (55, 56) is included in an agitator which agitates the developer contained in the case main body, wherein the agitator includes: an agitating rotation shaft rotatably supported around an axis in the case main body; and an agitating blade fixed along a longitudinal direction of the agitating rotation shaft, wherein the rotator (55, 56) includes the agitating rotation shaft or both of the agitating rotation shaft and the agitating blade, wherein the case main body includes: a storing case including the sidewalls (43F, 43B) erected around a bottom of the storing case, the storing case having an opened upper face; and a lid sealing the upper face of the storing case, and the storing case and the holder are integrally formed, and wherein the rotator (55, 56) includes a flange extending to a radial direction at the end in the axis direction of the rotator (55, 56), and characterized in that the holder includes: a pair of left and right ribs extending in upper and lower direction; and a bridge arranged between upper ends of the pair of left and right ribs and curved so as to project downward, and the flange is formed in a disk shape and held by the bridge. an agitating rotation shaft rotatably supported around an axis in the case main body; and an agitating blade fixed along a longitudinal direction of the agitating rotation shaft, wherein the rotator (55, 56) includes the agitating rotation shaft or both of the agitating rotation shaft and the agitating blade, wherein the case main body includes: a storing case including the sidewalls (43F, 43B) erected around a bottom of the storing case, the storing case having an opened upper face; and a lid sealing the upper face of the storing case, and the storing case and the holder are integrally formed, and wherein the rotator (55, 56) includes a flange extending to a radial direction at the end in the axis direction of the rotator (55, 56), and characterized in that the holder includes: a pair of left and right ribs extending in upper and lower direction; and a bridge arranged between upper ends of the pair of left and right ribs and curved so as to project downward, and the flange is formed in a disk shape and held by the bridge. a storing case including the sidewalls (43F, 43B) erected around a bottom of the storing case, the storing case having an opened upper face; and a lid sealing the upper face of the storing case, and the storing case and the holder are integrally formed, and wherein the rotator (55, 56) includes a flange extending to a radial direction at the end in the axis direction of the rotator (55, 56), and characterized in that the holder includes: a pair of left and right ribs extending in upper and lower direction; and a bridge arranged between upper ends of the pair of left and right ribs and curved so as to project downward, and the flange is formed in a disk shape and held by the bridge. a pair of left and right ribs extending in upper and lower direction; and a bridge arranged between upper ends of the pair of left and right ribs and curved so as to project downward, and the flange is formed in a disk shape and held by the bridge.