A toner case (21K, 21C, 21M, 21Y) comprising: a case main body (25, 111) configured to contain a toner and to rotate; a cover (27, 113) configured to cover an opening part arranged at the case main body (25, 111) and to maintain a rotation stop state when the case main body (25, 111) rotates; and a seal member (28, 114) interposed between the case main body (25, 111) and the cover (27, 113) and configured to maintain a rotation stop state when the case main body (25, 111) rotates, at least a part of the seal member (28, 114) being composed of an elastic material, wherein the case main body (25, 111) is configured to rotate around a rotation axis line, and the opening part is arranged at one end part in a direction of the rotation axis line of the case main body (25, 111), and the cover (27, 113) includes: a main body part having a communication space which communicates with an inside space of the case main body (25, 111) via the opening part; and a holding part configured to extend from the main body part toward an inside in the direction of the rotation axis line and to hold the one end part in the direction of the rotation axis line of the case main body (25, 111), wherein the seal member (28, 114) is located at an inside in the direction of the rotation axis line of the main body part and at an inside in a radial direction of the holding part, the holding part including: a locking part configured to lock the one end part in the direction of the rotation axis line of the case main body (25, 111); and a window part arranged at an outside in the direction of the rotation axis line of the locking part, and at least a part of the seal member (28, 114) is exposed to an outside of the toner case (21K, 21C, 21M, 21Y) via the window part, the toner case (21K, 21C, 21M, 21Y) being characterized in that the toner case (21K, 21C, 21M, 21Y) further comprises an agitating member (29, 115) composed of a resin film and configured to rotate integrally with the case main body (25, 111) and to agitate the toner in the communication space, wherein the agitating member (29, 115) includes a fixed part fixed to the case main body (25, 111) and interposed between the case main body (25, 111) and the seal member (28, 114) so that the fixed part comes into contact with the seal member (28, 114) 114). a case main body (25, 111) configured to contain a toner and to rotate; a cover (27, 113) configured to cover an opening part arranged at the case main body (25, 111) and to maintain a rotation stop state when the case main body (25, 111) rotates; and a seal member (28, 114) interposed between the case main body (25, 111) and the cover (27, 113) and configured to maintain a rotation stop state when the case main body (25, 111) rotates, at least a part of the seal member (28, 114) being composed of an elastic material, wherein the case main body (25, 111) is configured to rotate around a rotation axis line, and the opening part is arranged at one end part in a direction of the rotation axis line of the case main body (25, 111), and the cover (27, 113) includes: a main body part having a communication space which communicates with an inside space of the case main body (25, 111) via the opening part; and a holding part configured to extend from the main body part toward an inside in the direction of the rotation axis line and to hold the one end part in the direction of the rotation axis line of the case main body (25, 111), a main body part having a communication space which communicates with an inside space of the case main body (25, 111) via the opening part; and a holding part configured to extend from the main body part toward an inside in the direction of the rotation axis line and to hold the one end part in the direction of the rotation axis line of the case main body (25, 111), wherein the seal member (28, 114) is located at an inside in the direction of the rotation axis line of the main body part and at an inside in a radial direction of the holding part, the holding part including: a locking part configured to lock the one end part in the direction of the rotation axis line of the case main body (25, 111); and a window part arranged at an outside in the direction of the rotation axis line of the locking part, and a locking part configured to lock the one end part in the direction of the rotation axis line of the case main body (25, 111); and a window part arranged at an outside in the direction of the rotation axis line of the locking part, and at least a part of the seal member (28, 114) is exposed to an outside of the toner case (21K, 21C, 21M, 21Y) via the window part, the toner case (21K, 21C, 21M, 21Y) being characterized in that the toner case (21K, 21C, 21M, 21Y) further comprises an agitating member (29, 115) composed of a resin film and configured to rotate integrally with the case main body (25, 111) and to agitate the toner in the communication space, wherein the agitating member (29, 115) includes a fixed part fixed to the case main body (25, 111) and interposed between the case main body (25, 111) and the seal member (28, 114) so that the fixed part comes into contact with the seal member (28, 114) 114).