Electrodes and electrode structures

PROBLEM TO BE SOLVED: To provide an electrode and an electrode structure capable of preventing breakage of an insulator (dielectric) by avoiding concentration of unnecessary discharge at an edge part of an electric conductor (conductor), and improving reliability.SOLUTION: An electrode has a cylindrical insulator 14 having a hollow part 12 (a first hollow part 12a and a second hollow part 12b), and a conductor 16 arranged in the hollow part 12 of the insulator 14. An edge part 18 on an at least either edge face 16a of the conductor 16 is coated with the insulator 14.SELECTED DRAWING: Figure 1