The accident took place early morning in Maitidevi area, 3 kilometres from the capital Kathmandu.
The bus en route from Purano Baneshwar to Maitidevi overturned as it hit a roadside electric pole and injured 17 passengers, police said.
Of the total injured, eight are receiving treatment at the Thapathali-based Norvic hospital while nine others, including four critically injured, are undergoing treatment at the government-run Bir hospital, police said.
The police have launched an investigating.
Road accidents are not uncommon in Nepal and occur mostly due to poor infrastructure and reckless driving.
At least three people, including two women, died and 24 others were injured when a bus skidded off the road and fell into a 100-metre deep gorge in Nepal's Kailali district last month.
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