the mass spectrometer is required with reference to the flowchart in fig4 when mass spectrometer maintenance determination processing has not been completed after the measurement is started the cleaning determination processing of s 31 is carried out when the blank sample is loaded to the mass spectrometer at s 32 the cleaning of the mass spectrometer is carried out and at s 34 a determination is started with respect to the replacement of a part when the carryover is equal to or less than a predetermined value at s 35 the cleaning is completed and at s 36 the maintenance of the mass spectrometer is completed when the blank sample is not loaded to the mass spectrometer at s 33 the display section 400 is caused to display an error and a remeasurement is requested meanwhile when the mass spectrometer maintenance processing has been completed at s 37 a mode transition determination is made when there is a body fluid component the body fluid component analysis mode of s 38 is adopted and when there is not a body fluid component the solid analysis mode of s 39 is adopted at s 40 subsequently a determination is started with respect to the necessity for cleaning when cleaning or the like is required after a mass analysis measurement is made at s 41 at s 42 it is displayed that maintenance is required before the next measurement the user notified of the necessity for cleaning thereafter carries out the cleaning of the mass spectrometer to confirm whether cleaning has been carried out a dedicated case is used in cleaning and for the dedicated case a blank sample encapsulating a standard substance for checking cleaning is used when.