An electronic device includes: a printed circuit board; a casing including an upper case that covers the printed circuit board from an upper face side and a lower case that covers the printed circuit board from a lower face side, the casing housing the printed circuit board; a keyboard interposed between the printed circuit board and the upper case; an expansion unit interposed between the keyboard and the lower case; and a support member including a lattice portion that is interposed between the keyboard and the printed circuit board and that supports the keyboard with respect to the printed circuit board, with a portion of the lattice portion formed with an expansion unit housing opening that the expansion unit is disposed in.