West Australian Treasurer Troy Buswell has resigned after having a breakdown, Premier Colin Barnett says.
Mr Barnett said Mr Buswell called him at home on Sunday afternoon to advise him of his decision to resign.
Mr Buswell has been in hospital in Perth as well as a clinic in Sydney.
He remains under medical care, the premier said.
"He is not in a good place," Mr Barnett said.
Mr Barnett said he was concerned for Mr Buswell, who did not recall much of a drunken car crash on February 23, the night before his breakdown.
A witness says he had to stop his vehicle to avoid being struck by Mr Buswell near the MP's Subiaco home.
The witness told the West Australian newspaper Mr Buswell then struck the front fence of his home and spun the tyres before parking his car in the driveway.
Police have not charged him with any offences but began taking photos of the damaged car and fence on Monday morning, more than a fortnight after the accident.
Mr Barnett said Mr Buswell's chief-of-staff informed him on February 24 that he had suffered a breakdown, but the Premier's first knowledge of "anything to do with erratic driving" was on Sunday afternoon.
The Premier had last week said Mr Buswell would be on personal leave from cabinet for a fortnight for "health reasons" and asked for his privacy to be respected.
Mr Barnett said Mr Buswell had no excuse or explanation for the accident.
"He is a brilliant person. Unfortunately, he's also got a serious health issue," the Premier said.
Mr Barnett is temporarily taking on Mr Buswell's roles as treasurer and transport minister, and does not yet know who will deliver the state budget in May.
A permanent replacement is expected to be announced later this week.
© 2014 AAP
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