The yen fell to its weakest level versus the dollar since April 2011 after Shinzo Abe's Liberal Democratic Party swept back to power in Sunday's election, giving him a chance to act on pledges of expanded fiscal and monetary stimulus.
The yen tumbled to an almost nine-month low against the euro after the LDP won 294 seats in the 480-member Lower House, while Prime Minister Yoshihiko Noda's Democratic Party of Japan lost three-fourths of its lawmakers.
Tokyo stocks rose and government bonds slid.