According to reports, 39 others were injured in the mishap.
"The bus with Indian number plate fell some 200 meters down the road while negotiating a sharp bend along the downhill section of Prithivi Highway at Jhyaprekhola in Dhading district at around 6:40 this morning," ekantipur.com reported.
As many as 45 passengers were reportedly returning to Gorakhpur city in Uttar Pradesh after a pilgrimage to Pashupatinath Temple in Nepal when the mishap occurred.
The injured people were undergoing treatment in different hospitals.
A team of Nepal Army, Nepal Police, Armed Police Force and locals rushed to the spot and carried out rescue operations.