Developer case and image forming apparatus including the same

A developer case comprising:

• a case main body containing developer and having a discharge port to discharge the developer toward an outside of the case main body;
• a conveyer conveying the developer in the case main body toward the discharge port;
• a first tube arranged in the case main body so as to cover the discharge port;
• and
• a second tube communicating with an inside of the first tube at a downstream side of the discharge port in a conveying direction of the developer and extending in a direction crossing to the conveying direction,
• wherein the conveyer includes:
• a rotation shaft rotatably supported by the case main body;
• a first blade arranged on a circumferential face of the rotation shaft and exerting conveying force on the developer toward a downstream side of the conveying direction;
• and
• a second blade arranged on the circumferential face of the rotation shaft at the downstream side of the discharge port in the conveying direction and exerting conveying force on the developer toward an upstream side of the conveying direction,
• wherein the first blade is fixed between one end of the rotation shaft and the discharge port,
• wherein the first tube extends in a horizontal direction, and
• the second tube extends upward from a circumferential face of the first tube,
• wherein a storing room in which the developer is stored is arranged inside the case main body, and
• an evacuation room communicating with the inside of the first tube is arranged inside the second tube, and
• the second tube is provided with a through opening to directly communicate the storing room and the evacuation room,
• wherein the case main body includes:
• a storing case formed in a box shape with an opened upper face;
• and
• a lid sealing the upper face of the storing case, and
• the through opening is formed between an upper end of the second tube and a lower face of the lid.