The ac magnetic measurements on an organic metal, κ-(BETS)2FeCl4down to 60 mK revealed successive antiferromagnetic and superconducting phase transitions at about 0.65 K (≈TN) and 0.1 K (≈TC), respectively. These transitions correspond to the similar transitions in the Br-analogue, κ-(BETS)2FeBr4but the transition temperatures of FeCl4system are significantly lower than those of FeBr4system (TN= 2.5 K; TC= 1.1 K).