Abstract: The present invention provides a diode limiter device in which a first penetration hole is formed on a wall surface of an H surface; the PIN diode is supported by the PIN diode mounting side of the post with the PIN diode being electrically connected to the waveguide at the first penetration hole; a second penetration hole is formed on the other wall surface opposite to the wall surface; a second conductive boss which grasps the PIN diode with the post is electrically insulated and supported with respect to the second penetration hole; a wiring substrate with the detection diode and the resistor mounted thereon is installed; and the wiring substrate is supported in the second penetration hole by a third boss, thereby improving productivity and reducing cost.