Voters in Japan have been filing into polling stations since Sunday morning.
Candidates for Upper House seats are anxiously awaiting the results. The polls are set to close at 8 p.m. Japan local time.
Half of the Upper House seats are up for grabs. The election may prove to be a barometer of public opinion on Prime Minister Shinzo Abe's six and a half years in power. 370 candidates are running for 124 seats.
Key platform issues include hiking the consumption tax, the state's pension system, and amending the Constitution.