The Sensho Maru, carrying about 1300 tonnes of steel, sunk at the scene of the incident. A coastguard patrol boat rescued the captain of the ship, while the rest of the crew members remain missing. All crew members on the Sumiho Maru ship are safe, the coast guard said.
At the time of the incident, the visibility in the area was low due to dense fog.
The coast guard has deployed patrol vessels and helicopters to find the missing men.