This wiring board is provided with: a plurality of metal wires disposed upon an insulating substrate; and a transparent adhesive agent layer which is disposed upon the metal wires, and which is in direct contact with the metal wires. The metal wires include: a first metal wire which has a pulse signal supplied thereto; and a second metal wire which has a fixed electric potential applied thereto. The pulse signal has a reference level identical to the fixed electric potential, and has a pulse train in which a plurality of pulses having a pulse width of not more than 3 msec are arranged, the integral time of the pulses in a period of 600 seconds being less than 60 seconds.