A QCM sensor for detecting and measuring the components of a sample from a change in the main resonance frequency or from a change in the impedance caused when the surfaces of electrodes of a sensor device having electrodes opposed to each other on the front and back surfaces of a quartz substrate are exposed to a sample gas or to a sample solution. The sensor device has a multi-channel structure having four opposed electrodes (11A to 14A, 12B to 14B) arranged on the front and back surfaces of a quartz substrate (10). To the electrodes are secured receptors which are different for the components of a sample that is to be detected and measured. Components of a sample are detected and measured at one time using the different electrodes.
