An electronic device includes a housing and a circuit board contained in the housing. The housing includes a main wall, a side wall, a vertical wall, a first rib, and a second rib. The side wall is integrally formed with the main wall. The vertical wall is integrally formed with the main wall and faces to the side wall. The first rib is integrally formed with the side wall and the main wall. The first rib extends from the side wall toward the vertical wall. The first rib has a first end portion separated from the vertical wall. The second rib is integrally formed with the vertical wall and the main wall. The second rib extends from the vertical wall toward the side wall. The second rib has a second end portion separated from the side wall. The second rib faces to the first end.