Abstract: The present invention provides there is provided an electrochemical biosensor electrode structure that includes: a working electrode and a reference electrode used as electrodes for sample measurement being arranged separately from each other in lengthwise direction of a sample insertion path, the working electrode and the reference electrode each having at least one projection and at least one recess alternately arranged on a portion thereof corresponding to the sample insertion path, the projection of the working electrode being correspondingly adjacent to the recess of the reference electrode, the recess of the working electrode being correspondingly adjacent to the projection of the reference electrode; and at least two sample recognition electrodes used as electrodes for sample recognition being separated from each other and arranged adjacent and parallel to the working electrode and the reference electrode.