A faction or group that supports a particular opinion or proposal; those in favor. Antonym: hantai-ha (opposing faction).
委員会では賛成派が過半数を占め、提案は可決された。
In the committee the supporters were in the majority, and the proposal was approved.
その政策には賛成派と反対派がはっきり分かれている。
That policy clearly divides people into supporters and opponents.
賛成派の主張を取り入れて合意案を作成した。
We incorporated the supporters' arguments and drafted a consensus proposal.