Farmers and carmakers alike are airing concerns about the Japan-U.S. accord reached last week that endorsed Tokyo's participation in the Trans-Pacific Partnership talks, even as major domestic business lobbies hailed the move.

The agricultural sector fears that Japan's entry to the trade liberalization discussions will result in an influx of bargain-basement food imports, while automakers are lamenting the bilateral agreement reached Friday for what they perceive as unequal treatment compared to their South Korean rivals.

But business lobby groups welcomed the deal, saying it is essential that Japan join the ongoing discussions to determine a framework for the TPP as soon as possible in order to secure its national interests. The final accord is slated to be concluded by year's end.