PROBLEM TO BE SOLVED: To limit the target of load when small-scale photovoltaic power generation is used for household demand, and to supply power to the load even when photovoltaic power generation is interrupted at night or due to long-term rain or the like. A means to switch to external power (commercial power) is required so that this does not occur. SOLUTION: This is a distribution board device that switches and supplies power from photovoltaic power generation and power from an external power system in units of branch breakers, and is a main bus 5 for photovoltaic power generation and a main bus 4 for an external power system. The main bus 4 and the main bus 5 are connected by a switch 6 so as to automatically connect the main bus 4 and the main bus 5 when the power from the photovoltaic power generation is cut off, and a plurality of branch breakers. Is a distribution board device configured to select whether to connect to the main bus 5 for photovoltaic power generation or to the main bus 4 for an external power system for each branch breaker. [Selection diagram] Fig. 1
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