Chatterjee, who was a member of the state's women commission, said she is also quitting the commission since she is no longer in TMC.
"When I joined TMC I had said I want to work. Now I am quitting it as I feel suffocated there and can't work," Chatterjee said after joining the party in the presence of BJP state president Rahul Sinha.
"I felt that BJP is a party where I see everyone is trying to work for the society and hence I feel that I can connect with it," she said.
Sinha said that Chatterjee would campaign for the party for the next week's by-election to Bongaon Lok Sabha and Kishnagunj assembly seats.
"Those in TMC who are not involved in corruption should follow her footstep," he said.