FIELD: measurement; testing.SUBSTANCE: invention provides the analysis on the basis of non-invasively sample taken from a human body. According to the invention, a sampling unit comprises first reception unit (16) and second reception unit (18) that are for receiving sample liquid and are disposed so as to be separate from each other and in that first reception unit (16) includes identification substance (22) that binds to a substance to be detected and separates the substance to be detected within the sample liquid from a substance not subject to detection and second reception unit (18) is connected to reference electrode (21) via salt bridge part (25). Biosensor based on the described sampling unit is also proposed. According to the present invention, the measurement sensitivity can be improved by suppressing the binding of the non-detected substance to the identification substance located in the first reception unit.EFFECT: therefore, the concentration of the detected substance can be measured more reliabl
