According to one embodiment, a panel attachment assembly comprises a housing including a first wall with an opening, a cover panel fitted in the opening, and a built-in component fixed in the housing. The housing includes a first end edge defined by the first and second walls, and a second end edge defined by the first and third walls. The cover panel includes a first end face aligned with the first end edge and seen from the outside, a second end face aligned with the second end edge and seen from the outside, and flanges projecting from side edges. The built-in component has engagement sections at positions corresponding to ends of the flanges. These ends of the flanges contact the engagement sections, and the other ends contact the housing between the first wall and built-in component.