The present invention stably measures a bioelectric potential while ensuring a state of contact even when deviation between electrodes and fingers occurs in cases where there is no means of fixing the fingers and electrodes together. This electronic machine is composed of a housing that a user grips with the right hand and left hand, and measures the potentials of a first and second finger of the user. The first and second fingers are fingers of mutually different hands. The electronic machine is provided with: a first electrode group provided to a position in contact with the first finger, the first electrode group comprising a first principal electrode and at least one first auxiliary electrode provided to a position separated from the first principal electrode a second electrode group provided to a position in contact with the second finger, the second electrode group comprising a second principal electrode and at least one second auxiliary electrode provided to a position separated from the second principal electrode a biosignal processing unit for determining the state of contact pertaining to the first and second fingers, from the value of potential measured with the first electrode group and the value of potential measured with the second electrode group and an output unit for providing information pertaining to the states of contact of the fingers to the user, on the basis of the determination result.La présente invention mesure de manière stable un potentiel bioélectrique tout en assurant un état de contact même lorsquune déviation entre des électrodes et des doigts se produit dans des cas où il ny a aucun moyen de fixer les doigts et les électrodes ensemble. Cette machine électronique est composée dun boîtier quun utilisateur agrippe avec la main droite et la main gauche, et mesure les potentiels dun premier et dun second doigt de lutilisateur. Les premier et second doigts sont des doigts de mains mutuellement différentes. La machine électronique comporte
