A prominent Western Australian businessman has fallen to his death while parasailing on the Thai resort island of Phuket.

Roger John Hussey's wife was filming the flight on Kata beach when he plunged into the sea.

Australian Roger Hussey before the fall on Kata beach, Thailand. Credit:Facebook

A video of the flight posted on Facebook showed Mr Hussey being strapped into safety gear on the beach, but that straps between his legs were left undone.

He was relaxed and smiling.