The nation on course to elect woman prime minister in historic first
Over the last two decades, the country has had more than 10 leaders.
Actually, one expert likens taking up the nation's highest office to taking a "poisoned chalice".
But why does Japan keep changing leaders? This is partly because of it being a "one-party democracy", says Professor James Brown of Temple University Japan.
The Liberal Democratic Party's control on the political landscape means the main political competition comes from within the party, rather than from external parties.
"So within the LDP there are intense conflicts within different factions - they all desire their own clique to secure the top job."
"So even though you could be chosen as leader, the moment you're in office, you have dozens of people manoeuvring to try to get you out again."
Main Reasons Behind Rapid Turnover
- One-party dominance limits outside challenges
- Internal factional rivalries drive leadership contests
- The prime minister's position is often described as a "poisoned chalice"
- Political stability stays elusive despite financial power
