A biopotential measurement device includes: a branching section that branches a biopotential into plural analog potentials; a first conversion section that converts one of the analog potentials branched by the branching section into a digital potential on the basis of a designated first conversion condition; and a second conversion section that converts the other of the analog potentials branched by the branching section into a digital potential on the basis of a second conversion condition. The amount of data obtained after a conversion with the second conversion condition is smaller than the amount of data obtained after a conversion with the first conversion condition.