A partial discharge sensor evaluation method includes a first frequency characteristic measuring process in which, in a state where a reference antenna 3 for which a frequency characteristic in an effective height is known and a measuring antenna 2 are installed on a flat ground 1 to be separated by a predetermined distance from each other, a transmission characteristic measurer 4 measures a frequency characteristic of a transmission characteristic between the reference antenna 3 and the measuring antenna 2, and a second frequency characteristic measuring process in which, in a state where a measured antenna 9 is installed inside a cylindrical ground 6 buried in a circular opening 5 formed at a position where the reference antenna 3 has been installed, the transmission characteristic measurer 4 measures the frequency characteristic of the transmission characteristic between the measured antenna 9 and the measuring antenna 2.