PROBLEM TO BE SOLVED: To keep a germicidal effect by ion for a long time even after emission of ion is stopped.SOLUTION: An ion generator 1 includes a first ion generating part 10 generating negative ions and a second ion generating part 30 generating positive ions. The first ion generating part 10 includes a first electrode 21, a second electrode 22, a fine particle layer 23 having insulation fine particles 231 between the first electrode and the second electrode, and an electron emission element 20 which emits electrons by generating a voltage between the first electrode and the second electrode.
