Since the abolition of the monarchy, Nepal has seen 13 different governments, making many believe the current system has failed them.
Protesters voiced support for a political system change to save the country from further deterioration.
"We are here to give the king...full support and to rally behind him all the way to reinstating him," said 72-year-old Thir Bahadur Bhandari, a protester.
Fifty-year-old Kulraj Shrestha, a carpenter who initially opposed the monarchy but has changed his mind, echoed similar sentiments.