Patent ID: 8023855

Claim:
A development device comprising: a developer carrier configured to carry developer and disposed in a development case, partly exposed from an opening of the development case facing an image carrier; a developer-transporting member configured to transport the developer to the developer carrier and including two developer-transporting screws; and a discharging member housing a pressure release space separated from the developer-transporting member by a case and including a communicating path connecting to an area where the developer carrier faces the developer-transporting member, from which air is discharged into the pressure release space, a discharging port that opens in a longitudinal direction of the developer-transporting member being situated inside the pressure release space, air being discharged from the pressure release space via the discharging port, the communicating path having a length smaller than a length of the developer-transporting member in the longitudinal direction of the developer-transporting member.