Provided is a high-voltage application device that allows voltage to be appropriately applied not only to a conventional electrostatic coating, but also to agricultural products situated in a natural environment and having readily variable resistance. An output current value and an output voltage value are fed into a CPU (39) through a digital converter (103, 105), a discharge energy amount is obtained, the discharge amount per application cycle is determined to be appropriate or not, and the result is displayed by illuminating a green/red lamp column (107). Therefore, a technician can easily know when the discharge amount is insufficient and inappropriate, making it possible to adjust the applied voltage and to perform application work appropriately in accordance with the agricultural product.
