Patent ID: 7257347

Claim:
A developer containing device comprising: a housing that includes a first housing section and a second housing section and that is configured to contain a developer, wherein a protrusion provided on said first housing section and a recess provided in said second housing section are welded together through vibration welding in a state where said protrusion is fitted into said recess, and wherein an outer wall of said recess is thicker than an inner wall of said recess, wherein said first housing section includes: a vibration-direction protrusion arranged in a predetermined vibration direction of a vibration that is applied to at least one of said first housing section and said second housing section during said vibration welding; and a perpendicular-direction protrusion arranged in a direction that is perpendicular to said predetermined vibration direction; wherein said second housing section includes: a vibration-direction recess arranged in said predetermined vibration direction; and a perpendicular-direction recess arranged in the direction perpendicular to said predetermined vibration direction; wherein said vibration-direction protrusion and said vibration-direction recess are welded together through vibration welding in a state where said vibration-direction protrusion is fitted into said vibration-direction recess; wherein said perpendicular-direction protrusion and said perpendicular-direction recess are welded together through vibration welding in a state where said perpendicular-direction protrusion is fitted into said perpendicular-direction recess; and wherein an outer wall of at least one of said vibration-direction recess and said perpendicular-direction recess is thicker than an inner wall of that recess.