Making the announcement at at the party office, Union Minister J P Nadda said, "... Aspiration with nationalists forces (in Kerala) is immense. We have always tried that nationalist forces come together. We will see to it that our front comes victorious."
BDJS is linked to social organisation SNDP, which largely represents influential Ezhava community.
BDJS was formed recently and its chief Tushar Vellapally said his party was joining NDA unconditionally.
"Power has changed between UDF and LDF for four decades in Kerala but it has seen no development. It has seen unparallelled violence and no development. Kerala has reached a
standstill. People want an alternative," Nadda said.
Seat-sharing details will be worked out later, he said, adding that BJP was open to joining hands with other "nationalist forces".