Two women, one girl child and three minor boys, were killed as the taxi met with the accident at Sisneri-3 of Makwanpur district, 175 km south of Kathmandu, yesterday.
Brake failure was the reason behind the accident, police said. The taxi driver was seriously injured in the incident.
The taxi was heading towards Biratnagar, a town situated in eastern Nepal, from Kathmandu.
The driver and other injured person have been admitted to a local hospital for treatment.