The CPN (Unified Socialist) would not join the new government.
Leader Metmani Chaudhary said that the party would support the government based on its merits and demerits.
The CPN (Unified Socialist) has directed its lawmakers to vote in favor of the government led by Prime Minister Pushpa Kamal Dahal.
PM Dahal is scheduled to seek a vote of confidence in the Parliament today.
The CPN (Unified Socialist) has 10 lawmakers in the House of Representatives.