A cabinet (10) for a television set or an electric apparatus includes a casing having a front wall (11) and a bottom wall (12), a key top (13), guide structures (20a, 20c, 20b) for holding a narrow first printed wiring board (30) provided with a tact switch (30a) and a wide second printed wiring board (130) provided with a tact switch (1301) at different levels, respectively. Either of the first printed wiring board (30) or the second printed wiring board (130) can be held in the casing without changing the design of the cabinet (10).