Can I oppose a mark in Japan if I don’t own a Japanese registration?

Yes. Anyone can file an opposition. Ownership of a Japanese registration is not required, though you’ll need to substantiate whatever grounds you assert.

Oppositions are generally ex parte and paper-based. The panel may decide on the written record without a hearing.

What if I miss the opposition deadline?

You lose the right to oppose. Depending on the facts, you may still consider a post-registration invalidation action.

Can I rely on bad faith to oppose?

No. Bad faith cannot be the sole ground. Use it only as context to support absolute or relative grounds.

How long does the registration last if the opposition fails?

Ten years from the registration date, renewable indefinitely in 10-year increments.

Japan JPO Trademark Opposition: Grounds, Timelines & Evidence 2026

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