The TMC co-founder submitted his resignation to Rajya Sabha Chairman and Vice President Venkaiah Naidu.
After submitting the resignation letter, Roy said that he would decide his future course of action later.
" I have resigned, now I will go for leaves and then decide my future course of action," he told media.
Addressing a press conference here, Roy said that he was compelled to quit TMC "with a heavy heart".
"Today I am resigning from RS membership elected as a member of TMC, also from all posts of TMC as a primary member.With heavy heart and heavy pain, I am compelled to submit my resignation," he said.
Roy was earlier suspended from the TMC for anti party activities, soon after which, he resigned from the party's working committee.(ANI)