10 December 1968: the ‘300 million yen robbery’

Committing the daylight robbery of a huge amount of money often involves a very well-armed group of thieves. But not always. Sometimes all that is needed is a trusting group of guards and a great lie.

That was the case with Japan’s biggest robbery, when just under ¥300m (worth around US$820,000 in 1968) was stolen from a vehicle guarded by four security staff.

The ‘300 million yen robbery’ remains unsolved, nearly four and a half decades later.

On 10 December 1968, four employees of the Kokubunji branch of the Nihon Shintaku Ginko Bank were transporting ¥300m in bonuses for Toshiba factory workers, when a motorcycle policeman stopped their car.

The policeman approached, and informed the bank employees that their branch manager’s home had been blown up. He added that the police had received a warning that dynamite had been placed under their vehicle. The four guards got out as the policeman went underneath the car to check for explosives.

Soon after, the bank guards noticed smoke and flames from under the vehicle. The policeman rolled out, shouting that it was about to explode. As the panic-stricken guards ran away, the policeman got in and drove off, along with the money.

The investigation was vast. Some 170,000 policemen went through 110,000 suspect names using 780,000 montage pictures throughout Japan. But they did not find their robber.

At the scene of the crime, 120 pieces of evidence were found, including the ‘police’ motorcycle and the ‘smoke and flames’, which turned out to be an ordinary flare. Police later realised that some of the ‘evidence’ was planted there ingeniously to confuse the investigation.

After seven years , the investigation passed without an arrest and answered few questions. In 1988 the thief was relieved of any civil liabilities. This means that he is able to openly admit guilt without fear of arrest or prosecution. Nobody has yet to come forward in 46 years.