Das tendered his resignation to Rajya Sabha Chairman Hamid Ansari last night.
"As I have been appointed as the deputy chairman of the Odisha Planning Board and convener of the BJD's dalit cell, I prefered to resign from the Rajya Sabha membership. It is not possible to do three jobs simultaneously," Das said.
Of Odisha's 10 members in the Rajya Sabha, the ruling BJD had eight members.