Developing device, image forming apparatus and method of manufacturing developing device

A method for manufacturing a developing device including:

• a lower housing including a first housing part opened at an upper side;
• an upper housing including a second housing part opened at a lower side;
• and
• a blade member having an upper part fixedly attached to an outer face of the upper housing, and having a lower part facing to an outer face of the lower housing to make a gap between the blade member and the lower housing,
• the method comprising:
• a step of forming a first contact face on a first edge of the first housing part,
• a step of forming a second contact face coming into contact with the first contact face on a second edge of the second housing part,
• a step of forming a first facing surface on a part of the first edge positioned between the first housing part and the blade member at a side of the blade member from the first contact face,
• a step of forming a second facing surface facing to the first facing surface on the second edge,
• a step of arranging the first facing surface and the second facing surface so that an interval at a side of the blade member between the first facing surface and the second facing surface is broader than an interval at a side of the first contact face between the first facing surface and the second facing surface,
• a step of applying an adhesive agent to the first facing surface,
• a step of making the second contact face come into contact with the first contact face, and of bonding the second facing surface to the first facing surface,
• a step of fixedly attaching an upper part of the blade member to the outer face of the upper housing, and of sealing the gap between the blade member and the outer face of the lower housing by the adhesive agent flowed out from between the first facing surface and the second facing surface.