Japanese authorities spent 11.7 trillion yen ($73.5 billion) in foreign exchange intervention over the past month to support the yen, with limited effect.
Ministry of Finance data confirmed that officials stepped in during the Golden Week holidays when liquidity was thin.
The intervention came as the yen fell through 160 per dollar, the same level that triggered record dollar-selling intervention in 2024.
On April 30, the yen surged from 160.725 to 155.50. It extended gains to 155 by May 6 but later weakened to around 159.65.
The yen remains under pressure from the Middle East crisis and rising energy prices, as Japan imports almost all its oil.
