How to say "credentials" in Japanese

• 信任状しんにんじょうCommon
  nounDiplomatic credentials: the formal document certifying that an ambassador or envoy represents their country, presented to a head of state. It does not cover certificates of qualification or identity.
• 証明書しょうめいしょCommon
  nounThe general word for a certificate: an official document proving identity, qualification, or achievement. Use it for 'credentials' meaning documents that establish who you are or what you can do.
  もし予防接種よぼうせっしゅ証明書しょうめいしょがあったらお持もちください。↗

  If you have a certificate of immunization, please bring it when you come.

Choose 信任状 for the diplomatic sense of 'credentials' — documents certifying an envoy's authority — and 証明書 for certificates proving identity, qualification, or achievement, the sense 'credentials' usually has outside diplomacy.

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

• 信任状しんにんじょうcredentials
• 証明書しょうめいしょcertificate