Falling stones that may have been loosened by recent downpours crushed a rim skywalk and fell on the heads of several people at the Jinsixia gorge in Shaanxi Province.
Two of the victims are in critical condition, Liu Fengxin, deputy manager of the Jinsixia management committee, said.
He said the accident may have been caused by recent downpours.
The gorge has been closed temporarily, state-run Xinhua news agency reported.
Jinsixia is a local tourist site with natural attractions such as caves and forests and home to several tourist resorts.