How to say "counterpart" in Japanese

• カウンターパート
  nounCovers the person holding an equivalent position to yours, especially in business, government or international dealings. A katakana loanword, it is a less common but recognizable choice when you mean your opposite number.
• 対応者たいおうしゃ
  nounReally means the person who handles or deals with a matter, the one in charge of it. It matches 'counterpart' only loosely, and is seldom the word you want for an equivalent-position counterpart.

For a person holding the same position on the other side, 「カウンターパート」 is the closer fit; 対応者 chiefly means the person who handles a matter, so it suits 'counterpart' only loosely and is rarely the best choice.

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

• カウンターパートcounterpart
• 対応者たいおうしゃcounterpart
• 片割れかたわれone of a pair