A manufacturing method for an electrochemical sensor comprising an electrode having a resistance value within a predetermined range, the method comprising: an electrode forming step of forming an electrode, made of a porous material with electroconductivity, on an insulating substrate; and a resist forming step of coating a coating region on the electrode by a resist with non-electroconductivity in a solution state, and permeating communicating pores of the porous material with the resist whereby to adjust the resistance value of the electrode to within said predetermined range; wherein the coating region is determined on the basis of index information corresponding to the resistance value of the electrode; characterised in that the target resistance value that is a target value for the resistance value of the electrode, and a reference coating region that is a coating region for attaining the target resistance value are set in advance, and the index information is information indicating a high/low level of the resistance value of the electrode relative to the target resistance value, and in a case where the resistance value of the electrode is higher than the target resistance value, the coating region is made to be smaller than the reference coating region, while in a case where the resistance value of the electrode is lower than the target resistance value, the coating region is made to be larger than the reference coating region; the index information is information corresponding to an actual measurement value of a resistance value of an electrode of a test sensor, which is formed from the same material and under the same manufacturing conditions as those of the electrode, and of which a coating region of a predetermined pattern is coated by the resist; the coating region, determined on the basis of a difference between the actual measurement value of the resistance value of the electrode of the test sensor and the target resistance value, is coated by the resist in the resist forming step; and the actual measurement value of the resistance value of the electrode of the test sensor is the resistance value in a defined section including the coating region of the predetermined pattern. an electrode forming step of forming an electrode, made of a porous material with electroconductivity, on an insulating substrate; and a resist forming step of coating a coating region on the electrode by a resist with non-electroconductivity in a solution state, and permeating communicating pores of the porous material with the resist whereby to adjust the resistance value of the electrode to within said predetermined range; wherein the coating region is determined on the basis of index information corresponding to the resistance value of the electrode; characterised in that the target resistance value that is a target value for the resistance value of the electrode, and a reference coating region that is a coating region for attaining the target resistance value are set in advance, and the index information is information indicating a high/low level of the resistance value of the electrode relative to the target resistance value, and in a case where the resistance value of the electrode is higher than the target resistance value, the coating region is made to be smaller than the reference coating region, while in a case where the resistance value of the electrode is lower than the target resistance value, the coating region is made to be larger than the reference coating region; the index information is information corresponding to an actual measurement value of a resistance value of an electrode of a test sensor, which is formed from the same material and under the same manufacturing conditions as those of the electrode, and of which a coating region of a predetermined pattern is coated by the resist; the coating region, determined on the basis of a difference between the actual measurement value of the resistance value of the electrode of the test sensor and the target resistance value, is coated by the resist in the resist forming step; and the actual measurement value of the resistance value of the electrode of the test sensor is the resistance value in a defined section including the coating region of the predetermined pattern.