How to say "demonstrator" in Japanese

• デモンストレーター
  nounA loanword for the product sense: someone who demonstrates a product, for example in a store. It is not the word for a protester at a demonstration.
• デモ参加者デモさんかしゃ
  nounCovers the protest sense: a person taking part in a demonstration; it also covers marchers and picketers. Typical context: a news report on the demonstrators at a protest.

Use 「デモ参加者」 for the protest sense — someone taking part in a demonstration, march, or picket — and 「デモンストレーター」 for someone demonstrating a product in a store; both are relatively uncommon words.

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

• デモンストレーターdemonstrator (of a product, e.g. in a store)
• デモ参加者デモさんかしゃdemonstrator