The children fell 10 metres (33 feet) to the ground after an inflated jumping castle was lifted into the air in a gust of wind at an end-of-year celebration at a primary school in Devonport in the northwest of the state on Thursday.
"We all feel this terrible loss," Tasmania Premier Peter Gutwein said at a media conference.
Three boys and one girl aged 12 years and one boy and one girl aged 11 have now lost their lives. Two children remain in critical condition, police said, and one is recovering at home.
