A compact gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was developed for trace methane quantification in impure hydrogen. The sensor is equipped with a microresonator to confine the sound wave and enhance QEPAS signal. The normalized noise-equivalent absorption coefficients (1 σ) of 2.45×10-8cm-1 W/Hz1/2 for CH4 detection at 27 kPa were demonstrated with the QEPAS sensor configuration, which corresponds to the detection sensitivity of 3.2 ppm (1 s averaging time).