Fayyaz Sunmbol, the deputy inspector general of police in Quetta, says the blast Thursday morning in the village of Kuchlak also wounded five people.
The village is about 22 kilometers (13 miles) from Quetta, which is the capital of Baluchistan province.
Sunmbol says authorities are investigating whether it was a roadside bomb or a suicide bomber.
Baluchistan has been beset by violence from multiple groups. Baluch separatists often attack Pakistani military and government targets while Sunni Muslim extremist groups have repeatedly killed Shiite Muslims living in the region.
Many members of the Afghan Taliban also make their base in the province.
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