At a primary power-supply board 40, a Vsus power supply and a Vadd power supply of prescribed voltages are derived and outputted to a plasma display panel 11. Secondary power supplies Vsub1, Vsub2, and Vsub3 are derived from prescribed voltage levels of a transformer 42 for deriving Vsus and Vadd power supplies at the primary power-supply board 40. The secondary power supplies Vsub1, Vsub2, and Vsub3 are outputted to a secondary power-supply board 20 which is a board different from the primary power-supply board 40. Vset, Ve, and Vscan power supplies which can be used by the plasma display panel 11 are derived by regulating the secondary power supplies Vsub1, Vsub2, and Vsub3. Thus, since the primary power-supply board 40 and the secondary power-supply board 20 are provided separately, the secondary power-supply board 20 alone can be replaced to cope with the changes of the plasma display panel 11.