Soundproofing cover

A soundproofing cover comprising:

• a cover body configured to be opened and closed, and covering an attaching target when the cover body is in a closed state;
• a sound absorber disposed inside the cover body, and being elastically deformable;
• an engaging member formed in the cover body;
• and
• an engaged member formed in the cover body, and with which the engaging member is to be engaged,
• the cover body being maintained in the closed state with the engaged member engaged with the engaging member, wherein
• the soundproofing cover includes a restricting protrusion that protrudes inward from an inner surface of the cover body,
• the restricting portion includes a contact surface in contact with the attaching target, and restricts displacement of a portion of the cover body where the engaged member is formed toward an inside of the cover body with the contact surface of the restricting protrusion placed in contact with the attaching target in engaging the engaging member with the engaged member.