PURPOSE: To provide a lightning protection insulator device, having less responsibility for an element at the time of lightning attack, and capable of reducing the size and cost of a current-limiting element.

CONSTITUTION: This lightning protection insulator device is provided with a support insulator 3 suspended by the supporting arm 2 of an iron tower, and lightning protection insulators 17 incorporating a current-limiting element 18 having the nonlinearity of a voltage-current characteristic. A charge side discharge electrode 13 is mounted on the charge side of the support insulator 3. An earth side discharge electrode 24 is connected to the charge side of the lightning protection insulators 17 to form a series gap G2 oppositely to the charge side discharge electrode 13. At least one side of the charge side discharge electrode 13 of the supported insulator 3 or the earth side discharge electrode 24 of the lightning protection insulators 17 is made coil 14 and 25 shapes.