"Congratulations to @MamataOfficial ji & her team on taking oath. Looking forward to working closely with the WB Govt for the state's growth," Modi tweeted.
His tweet came shortly after 61-year Banerjee was sworn in as the Chief Minister of West Bengal for the second consecutive time, heading a 42-member ministry.
She was administered oath of office and secrecy by state Governor Keshri Nath Tripathi at the sprawling Red Road.