To provide a power distribution board repair method capable of readily preventing signals of a power line communication system from leaking to a power distribution board, and preventing interference between groups with the power distribution board therebetween.

The power distribution board 1 repair method adds a function for suppressing passage of the power line communication signals to the power distribution board 1, having a breaker 3 therein, and connects capacitors 8 for filter applications for suppressing the passage of the power line communication signals, to both the primary side and the secondary side of the breaker 3. Alternatively, it parallel-connects a plurality of capacitor elements 9, having different static capacities to an electric circuit, inside the power distribution board 1.