Provided are a casing for an electrical apparatus for housing an electrical apparatus includes: a casing body having an opening; a cover body that includes a flat plate-like cover portion having a rectangular shape for covering the opening, and outer side surface cover portions that are continuous to respective sides of the flat plate-like cover portion and cover outer side surfaces of the casing body; and first ribs that are provided on the outer side surfaces of the casing body covered by the outer side surface cover portions and extend along the respective sides, and a power control apparatus that includes the casing for an electrical apparatus and the electrical apparatus housed in the casing for an electrical apparatus.