Objective: The present study was aimed at clarifying the effect of vibration syndrome (VS) on the peripheral nervous system in the lower extremities of patients with VS due to rock-drill work. Methods: Fifty-three patients with VS due to previous exposure to vibration from rockdrilling work and 55 age-matched controls were examined for sensory nerve conduction velocities in the medial plantar nerve (SCV-P). The patient group was divided into three subgroups, outdoor rock-drill workers with vibration-induced white finger (VWF) (N=10), tunnel workers with VWF (N=27) and tunnel workers without VWF (N=16). Results: ANOVA of SCV-P for the four groups showed F=3.23 (dF=3, 104, p=0.0253). A significant difference was found between the controls and outdoor rock-drill workers with VWF group (p=0.0261) by multiple comparison using Scheffe's method. Conclusion: These findings suggest that peripheral nervous system function in the lower extremities of patient with VS is affected by cold exposure and circulatory disturbance manifested as VWF.