Wearing a Tangkhul Naga haora muffler, Shah walked in when Hishey Lachungpa of the Sikkim Democratic Front was taking oath after being re-elected to the Upper House.
As he walked towards his allocated seat, BJP members and ministers began thumping their desks. Some even rose from their seats to welcome Shah.
While the BJP trounced the CPM to win the Tripura Assembly polls, it is in alliance with local parties which won elections in Meghalaya and Nagaland.
Shah was seated in his chair by the time Lachungpa finished taking oath in Hindi and signed off with "Jai Hind".
Members also thumped their desk to welcome Lachungpa.
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