Recent research has unveiled the aperiodic component of neural power spectra as a promising non-invasive biomarker for the balance between excitatory and inhibitory neural processes (E-I balance), assessable through electroencephalography (EEG) and magnetoencephalography (MEG). Through simulations and in vivo local field potential assessments, it has been demonstrated that a reduced slope of the aperiodic component indicates an excitatory state, whereas an increased slope suggests an inhibitory state. Nonetheless, the effectiveness of the aperiodic slope as a marker for E-I balance in somatosensory processing remains to be established. Consequently, our investigation aimed to determine if there is a relationship between the aperiodic component in the primary somatosensory cortex and Paired-pulse inhibition (PPI), which is believed to mirror somatosensory inhibitory capability, utilizing MEG. PPI was assessed by delivering stimuli to the right median nerve at various interstimulus intervals (ISIs: 30, 50, 100, 200, and 300 ms). The aperiodic component was calculated from five minutes of resting-state, closed-eye MEG recordings in the area corresponding to the primary somatosensory cortex, activated by stimulation of the right median nerve. Our correlation analysis revealed a significant negative correlation between the intensity of PPI and the slope of the aperiodic component for ISIs of 30 and 50 ms. These findings endorse the aperiodic component as a valuable indicator of E-I balance within the primary somatosensory cortex.