noun
allied political party; friendly party
Used in political contexts to refer to a party that is allied with or friendly to one's own party. Not a general term for any friendly group.
与党は友党と連立政権を組んだ。
The ruling party formed a coalition government with an allied party.
選挙協力のため、友党と候補者を調整した。
For electoral cooperation, they coordinated candidates with a friendly party.