Providing a measuring device using the same biosensor to allow reliable puncturing increases the reliability of the measurement results. I a biosensor (4), the element substrate (9), a detector (10), the connection terminal (11), the conduction lines (12), the cutout section (13). Provided on the element substrate (9) on the detector (10) detects the specific component in the specimen by attaching the sample. The element substrate is provided (9) on the connection terminal (11) acquires a current corresponding to a predetermined composition. Conduction line (12) is connected to (11) and detector (10) connecting terminal. Notch (13) is formed along the outer periphery (10) detector, so as to surround the plurality of directions of the detector (10) at least.
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