Koirala inaugurated the conference and will seek donors' help to rebuild the country at an estimated cost of $7 billion.
Also read: World Bank announces $500 mn for Nepal
Indian Foreign Minister Sushma Swaraj is attending the conference and is likely to make an announcement of granting an aid of $1 billion.
Chinese Foreign Minister Wang Yi and over 300 delegates from 60 nations were also present at the meeting.
The two-day conference in capital Kathmandu is being organised by the Nepal government in order raise funds to reconstruct the physical infrastructures of the country destroyed by a massive 7.9-magnitude earthquake on April 25.