Translation guide
A ring or holder for keeping keys together. In Japanese, the most common term is キーリング (kīringu), a loanword from English. Other terms exist for specific types or contexts.
A ring, usually metal, used to hold keys together.
The most common and direct translation, widely understood.
新しいキーリングを買った。
I bought a new key ring.
Specifically a key case or key pouch, not a simple ring. Use when referring to a leather or fabric holder that encloses keys.
キーケースに鍵をしまった。
I put the keys in the key case.
Often refers to a key chain or key holder, which may include a decorative element or strap. Can be used interchangeably with キーリング in casual contexts.
このキーホルダーは友達からのお土産です。
This key chain is a souvenir from a friend.