Analyzer and analyte extraction cartridge

Small analyzer of measurement error even when the extraction of the analyte detection and in parallel (blood glucose level measuring device) is obtained. The blood glucose level measuring device (100), a light receiving element glucose extracted from the subject and the sensor member (26) comprising a measurement surface (26a) to be supplied, and outputs a signal based on supplied to the measurement plane glucose ( 34), a sensor contact surface that contacts the measuring surface (23a), which has a skin-contacting surface which contacts the skin of the subject (23b), the mesh sheet to be supplied to the measurement plane glucose from the skin contact surface ( It is equipped with a 23) and. Further, the mesh sheet, while in contact with the skin, is configured to maintain a substantially constant distance between the measurement surface and the skin.