PROBLEM TO BE SOLVED: To provide a portable high-voltage application device which is small-sized, easy to convey, and can continuously and stably output sufficiently high high-voltage pulse power even when working outside.SOLUTION: The high-voltage application device includes: a high-voltage generating part including a Cockcroft-Walton circuit with a built-in bleeder resistance； a high-voltage pulse application part integrally provided with a hand-holding part 55； a discharge side electrode 63 to which an output electric voltage of the high-voltage generating part is supplied； a ground side electrode 65 opposing to the discharge side electrode 63 through a discharging gap G； and an application side electrode 69 conductively connected with the ground side electrode 65 and applying a body to be applied. Most part of the high-voltage part is housed in a straight protective tube (an insulating protective cover 57+ insulating or semi-conductive discharge gap cover 59) and only the application side electrode 69 is exposed outside thereof.【課題】小型で搬送が容易で、屋外の作業でも継続して安定的に十分に高い高電圧パルスパワーを出せる手持ち式の高電圧印加装置を提供する。【解決手段】高電圧発生部は、ブリーダ抵抗を内蔵したコッククロフトウォルトン回路を備え、高電圧パルス印加部は、手持ち部５５に一体に設けられ、高電圧発生部の出力電圧が供給される放電側電極６３と、放電ギャップＧを介して対向した接地側電極６５と、接地側電極６５と導通され被印加体に印加する印加側電極６９とを備え、直状の保護筒（絶縁性の保護カバー５７＋絶縁性乃至半導電性の放電ギャップカバー５９）内に高電圧印加部の大部分が収容され、印加側電極６９のみがその外に出て露出している高電圧印加装置。【選択図】図３
