Development apparatus and image formation apparatus

摘要

A development apparatus has: a housing in which a developer supplying/collecting unit and a developer stirring unit are arranged with a circular passage for carrying developer; a developer carrying member placed at a front side of the developer supplying/collecting unit; a developer supplying/collecting section for carrying the developer; and two developer stirring sections arranged in the front-and-rear direction so as to face, wherein, a toner supplying opening is formed above a position where the two developer stirring sections face and at an upstream side in a developer carrying direction, the two developer stirring sections are rotated at the facing position to move peripheries in a forward direction, the developer carrying direction by the two developer stirring sections is substantially opposite to one by the developer supplying/collecting section, and developer carrying capability of the two developer stirring sections is set to be made equal to that of the developer supplying/collecting section.