A method of measuring glucose in blood through use of a biosensor, the biosensor comprising: a first electrode system including a first working electrode and a first counter electrode; a second working electrode; and a liquid detecting electrode, wherein only the first electrode system is provided with a reagent layer comprising an oxidoreductase that acts upon the component and a mediator; the method comprising the following sequence of steps: detecting a blood sample by the liquid detecting electrode; a first step of obtaining a first current value by applying a first voltage to the second working electrode and the first counter electrode, using the second working electrode as a working electrode and the first counter electrode as a counter electrode; a second step of obtaining a second current value by applying a second voltage to the first working electrode and the first counter electrode, using the first working electrode as a working electrode and the first counter electrode as a counter electrode; a third step of obtaining a third current value by applying a third voltage to the second working electrode and the first working electrode, using the second working electrode as a working electrode and the first working electrode as a counter electrode; and wherein a surface of the second working electrode is cleaned by applying a voltage to the second working electrode before the third step and the first step; the second current value including information on an amount of glucose in the blood, the third current value including information on an amount of blood cells in the blood, the first current value including information on an amount of an interfering substance in the blood, the method comprising calculating a value of glucose in the blood corrected for the amount of blood cells and the amount of an interfering substance through use of the first, second, and third current values. a first electrode system including a first working electrode and a first counter electrode; a second working electrode; and a liquid detecting electrode, wherein only the first electrode system is provided with a reagent layer comprising an oxidoreductase that acts upon the component and a mediator; the method comprising the following sequence of steps: detecting a blood sample by the liquid detecting electrode; a first step of obtaining a first current value by applying a first voltage to the second working electrode and the first counter electrode, using the second working electrode as a working electrode and the first counter electrode as a counter electrode; a second step of obtaining a second current value by applying a second voltage to the first working electrode and the first counter electrode, using the first working electrode as a working electrode and the first counter electrode as a counter electrode; a third step of obtaining a third current value by applying a third voltage to the second working electrode and the first working electrode, using the second working electrode as a working electrode and the first working electrode as a counter electrode; and detecting a blood sample by the liquid detecting electrode; a first step of obtaining a first current value by applying a first voltage to the second working electrode and the first counter electrode, using the second working electrode as a working electrode and the first counter electrode as a counter electrode; a second step of obtaining a second current value by applying a second voltage to the first working electrode and the first counter electrode, using the first working electrode as a working electrode and the first counter electrode as a counter electrode; a third step of obtaining a third current value by applying a third voltage to the second working electrode and the first working electrode, using the second working electrode as a working electrode and the first working electrode as a counter electrode; and wherein a surface of the second working electrode is cleaned by applying a voltage to the second working electrode before the third step and the first step; the second current value including information on an amount of glucose in the blood, the third current value including information on an amount of blood cells in the blood, the first current value including information on an amount of an interfering substance in the blood, the method comprising calculating a value of glucose in the blood corrected for the amount of blood cells and the amount of an interfering substance through use of the first, second, and third current values.