House of Representatives election; lower house election
Refers specifically to the election for Japan's lower house of the Diet. Often abbreviated to 衆院選 in news contexts.
The next House of Representatives election is scheduled for next autumn.
Voter turnout for the lower house election hit a record low.
Compound of 衆議院 (House of Representatives) and 選挙 (election). The term is a straightforward modern political term with no obscure historical derivation.