Search for missing man on SA's west coast

A search is underway for a man missing in waters off Hall Bay on South Australia's Eyre Peninsula.

An aluminium boat with two men and two boys on board overturned on Friday night in area between Coffin Bay and Elliston, police say.

One of the men and the two boys managed to swim to shore but a man in his 50s is still missing.

Local fisherman and State Emergency Service volunteers are helping in the search with STAR group police on their way by helicopter.