The man disappeared from the grounds of the clinic in Säter during an hour’s unsupervised leave.
He was convicted in 1997 for the murder of an elderly woman and has never before attempted to escape.
“This is a patient who is going to be here for a long time but who has also been allowed free movement,” said the clinic”s security coordinator Lillemor Lövström.
It is the second time in the space of a month that a patient at the clinic has escaped.
A patient who left the grounds during an hour’s unsupervised leave at the end of July has not yet been found.