Cover, recording device, and method for manufacturing cover

A cover using a plate material comprising:

• an outer peripheral portion having a top face and a bottom face, to interpose a gasket between the bottom face and a base and to be fastened to the base by a fastener from the top face;
• and
• a connection portion provided on the outer peripheral portion for conducting the fastening, wherein
• the connection portion is provided with a fastening face that is fastened by the fastener on the top face and a connecting face that is connected to the base on the bottom face, and the connection portion is formed into a stepped shape with steps that form a recessed shape on the top face and a projected shape on the bottom face relative to the outer peripheral portion,
• the steps are set to have dimensions less than a thickness of the plate material,
• the stepped shape is provided with an outer face of the steps and an inner face of the steps, the outer face spanning between the fastening face and the top face of the outer peripheral portion and the inner face spanning between the connecting face and the bottom face of the outer peripheral portion, and
• the outer face and the inner face do not overlap each other in a planer direction of the connecting face.