PROBLEM TO BE SOLVED: To acquire biological signals for a long time.SOLUTION: A biological signal acquisition electrode 1 includes: a substrate 10 having insulation property an electrode unit 11 made of conductive material and disposed on a surface of the substrate 10 in contact with a living body and a heater unit 12 made of conductive material for heating the skin surface of a living body in contact with the electrode unit 11. A control part 2 includes a biological signal measuring unit for acquiring biological signals detected by the electrode unit 11 and a heating control unit for heating the skin surface of a living body in contact with the electrode unit 11 by supplying the heater unit 12 with current to be heated.