結論 日本語入力の設定で円記号をバックスラッシュに割り当てるのはやめて、Hammerspoon で以下のスクリプトを使います。 --- Perfect backslash(\) for Mac JIS keybord users -- The problem: -- On Mac, Japanese IME setting to replace Yen-backslash is ignored by -- IntelliJ, jEdit or such as because JVM uses another keymap traditionally. -- Solution: -- Use Hammerspoon (http://www.hammerspoon.org/) instead of Japanese IME -- setting. Paste below to your ~/.