PROBLEM TO BE SOLVED: To provide a bioelectric signal measurement device that can accurately measure a bioelectric signal without making a passenger come in direct contact with power, and further to provide a vehicle seat.SOLUTION: A bioelectric signal measurement device 1 comprises, in positions substantially opposing a human body without direct contact with the human body: a predetermined voltage signal output electrode 31 a first bioelectric signal detection electrode 11 and a second bioelectric signal detection electrode 21. A gain correction value generation unit 51 calculates a first gain correction value K1 and a second gain correction value K2 based on first signal strength A and second signal strength B respectively detected by the first bioelectric signal detection electrode 11 and the second bioelectric signal detection electrode 21, and corrects gains of the bioelectric signals detected by the first bioelectric signal detection electrode and the second bioelectric signal detection electrode, respectively, according to the calculation results. A difference output unit 61 generates a bioelectric signal from a difference between corrected bioelectric signals detected by the first bioelectric signal detection electrode 11 and the second bioelectric signal detection electrode 21 after correction.
