Housing structure, optical scanning device, and image forming apparatus

A housing structure comprising:

• a housing configured to house therein components for use by an image forming apparatus and having an opening;
• a cover member configured to cover the opening of the housing and including an adherend portion;
• a sealing member placed between an opening end of the housing and the cover member and configured to seal between the cover member and the housing by being compressed when the cover member is attached to the housing,
• the sealing member adhering to the adherend portion of the cover member, and
• at least one groove being formed on the cover member;
• wherein the cover member has a shape with an open face, and includes a bottom, an outer wall upwardly extending from an outer periphery of the bottom, and an inner wall arranged inside the outer wall,
• wherein a side wall of the housing is interposed between the outer wall and the inner wall of the cover member, and compressed against the sealing member,
• wherein the at least one groove is formed on the bottom, the outer wall, or the inner wall of the cover member.