Oni are symbolic beings in Japanese folk belief that give a human-like form to invisible threats—illness, disaster, fear, and spiritual impurity—so people can recognize them and deal with them through ritual, stories, and everyday life. This article explains what an oni is (beyond “demon”), why oni have a recognizable appearance, and how their symbols—like the iron club and tiger-skin pants—connect to language, festivals, and even protective uses in modern Japan. Quick Summary: Oni are not just “evil monsters.” They are cultural symbols that make unseen danger visible, so it can be named, acted out, and driven away—especially through rituals like Setsubun. ...
