He became a Member of Legislative Assembly in 2011 after contesting in the Tamil Nadu Legislative Assembly election as a Desiya Murpokku Dravida Kazhagam (DMDK) candidate for the constituency of Peravurani.The Hindu : States / Tamil Nadu : Two more DMDK MLAs meet Jayalalithaa On 21 February 2016, Arun Pandian and nine other MLAs tendered their resignations prior to the Assembly election in the state. On 25 February 2016, he joined the All India Anna Dravida Munnetra Kazhagam (AIADMK) in the presence of party general secretary and Tamil Nadu chief minister Jayalalithaa.
