Patent ID: 8303800

Claim:
An electrochemical sensor device, comprising: a channel portion formed in a substrate; and working electrodes for subjecting an analyte in a solution flowing in the channel portion to electrochemical measurement, wherein: the channel portion includes a first stem portion through which a first solution flows and a second stem portion through which a second solution flows, and a plurality of measuring portions extending toward downstream sides of the first stem portion and the second stem portion and individually provided with the working electrodes; the plurality of measuring portions include a confluent portion through which a mixed solution of the first solution and the second solution flows, the confluent portion extending from a portion where a branch portion branching from the first stem portion and a branch portion branching from the second stem portion merge with each other toward a downstream side, a first independent portion through which the first solution flows, the first independent portion extending toward the downstream side of the first stem portion without merging with any other channel, and a second independent portion through which the second solution flows, the second independent portion extending toward the downstream side of the second stem portion without merging with any other channel; and the working electrodes each have a plurality of conductive protrusion portions formed to protrude from a bottom surface of the measuring portion and disturbing the flows of the solutions flowing above the working electrodes, wherein: the plurality of protrusion portions include a plurality of plate-like protrusion portions each formed in a plate-like shape and crossing the measuring portion to block part of a flow in a longitudinal direction of the measuring portion and a plurality of columnar protrusion portions each formed in a columnar shape; the plurality of plate-like protrusion portions include an upstream-side, plate-like protrusion portion and a downstream-side, plate-like protrusion portion disposed on a downstream side of the upstream-side, plate-like protrusion portion; and the plurality of columnar protrusion portions are disposed between the upstream-side, plate-like protrusion portion and the downstream-side, plate-like protrusion portion.