How to say "stand-in" in Japanese

• 替え玉かえだまCommon
  nounA stand-in who passes as the person they replace, often covertly or dishonestly — the ringer or double sense. Use it when false identity is involved, not for open, ordinary replacements.
  警察けいさつが追おっていたのは替え玉かえだまで、その間あいだに真犯人しんはんにんを逃のがしてしまった。↗

  The police followed a red herring while they let the true criminal escape.
• 身代わりみがわりCommon
  nounStanding in for someone else by taking on what would befall them — punishment, blame, or danger; hence its scapegoat sense. It stresses substitution for a person's sake, not merely filling a position.
  その司祭しさいは病気びょうきの男おとこの身代みがわりになった。↗

  The priest took the sick man's place.
• 代役だいやくCommon
  nounThe word for filling a role or part: an actor who takes over a role, an understudy or fill-in. Use it when the stand-in steps into a specific role, especially on stage or screen.
  彼かれは父親ちちおやの代役だいやくをした。↗

  He was substituted for his father.
• 代わりかわりJLPT N4approx.Common
  no-adjectiveThe general word for a substitute, proxy, or deputy — a person or thing acting in another's place. When no special nuance such as a role or deception is involved, this is the neutral choice.
• 吹き替えふきかえCommon
  nounA stand-in who takes an actor's place only in voice — the double heard rather than seen, as in dubbing. It is not a general word for stand-ins; use it for voice replacement.

Choose 「代わり」 for a general substitute or proxy, 代役 for someone filling a role, 「身代わり」 for taking another's place in punishment or blame, 「替え玉」 for a ringer passed off as the real person, and 「吹き替え」 for a voice double.

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

• 替え玉かえだまstand-in
• 身代わりみがわりsubstitution (for someone else)
• 代役だいやくsubstitute (actor)
• スタンドインstand-in
• 代り役かわりやくsubstitute actor
• 代わりかわりstand-in
• 吹き替えふきかえstand-in (actor)
• 代理だいりproxy