Wazoo on the Afghan border, officials said.The device exploded by remote control as a military vehicle passed through the Sararogha village area in the mountains of South Waziristan, which is part of Pakistain's semi-autonomous tribal district.
"At least 10 soldiers were maimed, three of them seriously," a security official told AFP.
A local intelligence official confirmed the kaboom and casualties.
Pakistain carried out a sweeping offensive in 2009 in South Waziristan targeting the country's main Taliban faction, but many of their commanders and foot soldiers are believed to have decamped to neighbouring North Waziristan.