Method of fixing regulating blade made of resin material

A method of fixing a regulating blade made of a resin material to a mounting portion of a developing device frame made of a resin material, wherein the regulating blade is provided opposed to and in non-contact with a developer carrying member for carrying a developer for developing an electrostatic latent image on an image bearing member and wherein the regulating blade is capable of regulating an amount of the developer carried on the developer carrying member, the method comprising:

• an adhesive applying step of applying an adhesive onto the mounting portion;
• a first force applying step of applying a first force to the regulating blade so that the regulating blade is urged against the mounting portion on which the adhesive is applied in said adhesive applying step;
• a second force applying step of applying a second force to the mounting portion so as to support the mounting portion on which the adhesive is applied in said adhesive applying step;
• and
• a fixing step of fixing, using the adhesive applied on the mounting portion in said adhesive applying step, the regulating blade to the mounting portion in a state in which the first force is applied to the regulating blade in said first force applying step and the second force is applied to the mounting portion in said second force applying step.