Patent ID: 8012321

Claim:
A biosensor system comprising: a biosensor chip; and a measuring instrument which measures biological information on a biological material supplied to the biosensor chip, wherein the biosensor chip comprises: a reaction portion which is formed to be electrically connected to a plurality of sensor electrodes and to which the biological material is supplied, and the measuring instrument comprises: an insertion determining circuit which determines attachment and detachment of the biosensor chip; a biological information measuring circuit which measures the biological information; an insertion portion into which the biosensor chip can be inserted; an insertion determining circuit side connector electrode which is electrically connected to the insertion determining circuit and is provided to come in electrical contact with a first sensor electrode of the biosensor chip when the biosensor chip is inserted into the insertion portion; a measuring circuit side connector electrode which is electrically connected to the biological information measuring circuit and is provided to come in electrical contact with a second sensor electrode of the biosensor chip when the biosensor chip is inserted into the insertion portion; and a ground electrode provided to come in electrical contact with the first sensor electrode when the biosensor chip is inserted into the insertion portion, wherein the insertion determining circuit side connector electrode and the ground electrode are structured and arranged to come into the electrical contact with the first sensor electrode contemporaneously with the measuring circuit side connector electrode coming into the electrical contact with the second sensor electrode when the biosensor chip is inserted in the insertion portion, and wherein the insertion determining circuit side connector electrode and the ground electrode are structured and arranged to remain in the electrical contact with the first sensor electrode, and the measuring circuit side connector electrode is provided to remain in the electrical contact with the second sensor electrode when the biosensor chip is fully inserted in the insertion portion and throughout the insertion from the contemporaneous electrical contact through the biosensor chip being fully inserted.