How to say "flashlight" in Japanese

• フラッシュCommon
  nounPrimarily the flash of a camera or a flashbulb; the 'flashlight' sense is secondary, and this is not the word for a handheld electric light — use 懐中電灯 for that.
  フラッシュを使つかってもいいですか。↗

  Is it all right to use a flash here?
• 懐中電灯かいちゅうでんとうCommon
  nounThe usual word for a handheld electric torch: a battery-powered light you carry in the hand or pocket, as during a power cut or when searching a dark place.
  この懐中電灯かいちゅうでんとうは明あかりが弱よわくなってきた。↗

  This flashlight is getting dim.
• トーチCommon
  nounA loanword covering the same handheld torch sense, though in practice it often suggests the flame-producing torch used in welding, so 懐中電灯 is usually the clearer choice for a flashlight.

For a handheld battery-powered light, 懐中電灯 is the word you want; 「トーチ」 is a loanword for the same thing but also suggests a welding torch; 「フラッシュ」 is really a camera flash, not a flashlight.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• フラッシュflash (esp. of a camera)
• 懐中電灯かいちゅうでんとう(electric) torch
• フラッシュライトflashlight
• トーチ(electric) torch