Patent ID: 8755712

Claim:
A developing device comprising: a first developing body that is disposed in a device body and develops a developing agent image on a development surface using a developing agent; a second developing body that is disposed in an upper stage of the first developing body in the device body and develops a developing agent image on the development surface using the developing agent; a first developing pole that is formed as a magnetic pole for performing development in the first developing body; a first delivery pole that is formed in a position opposed to the second developing body in the first developing body and formed as a magnetic pole for performing delivery of the developing agent between the first developing body and the second developing body; a first conveyance pole that is formed between the first developing pole and the first delivery pole in the first developing body and formed as a magnetic pole for conveying the developing agent from the first delivery pole to the first developing pole; a second developing pole that is formed as a magnetic pole for performing development in the second developing body; a second delivery pole that is formed in a position opposed to the first developing body in the second developing body and formed as a magnetic pole for performing delivery of the developing agent between the first developing body and the second developing body; a second conveyance pole that is formed between the second developing pole and the second delivery pole in the second developing body and formed as a magnetic pole for conveying the developing agent from the second delivery pole to the second developing pole; and a sealing member that is disposed between a region where the first delivery pole and the second delivery pole are opposed to each other and the development surface, and adjacently to the first developing body and the second developing body at distances so small that developing agents formed as magnetic brushes on the first conveyance pole and the second conveyance pole touch the sealing member.