UP Governor Ram Naik today administered oath to Singh, who is an from Campiyarganj in Gorakhpur.
Singh (49) is the son for former chief minister Vir Bahadur Singh.
He took the oath in Sanskrit at a function in Raj Bhawan, an official spokesman said.
Besides him, four MLAs - Durga Prasad Yadav, Ram Pal Verma, Fagu Chauhan and Ramveer Upadhyay - were sworn in by the Governor to administer oath to the newly-elected UP MLAs over the next two days.
Chief Minister Yogi Adityanath, Parliamentary Affairs Minister Suresh Khanna and Speaker Mata Prasad Pandey were present, the spokesman added.
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