Objective: Depressed patients frequently complain about vegetative symptoms. The relation between depression and disturbances of autonomic regulation has been recognised for a long time. The aim of this study was to investigate whether sympathetic skin responses (SSRs) were affected by electroconvulsive therapy (ECT) in patients with major depression. Materials and Methods: In our study we examined 40 patients diagnosed with major depression who would take ECT during a course of treatment and 30 age-matched healthy subjects. Sympathetic skin responses were assesed on the same day before and after the ECT. Pre-ECT, post-ECT, and control groups' measurements of SSR were compared by non-parametric tests. Results: The mean post-ECT latency of SSR (1.25±0.11 ms) was statistically significantly different (p <0.05) compared with pre-ECT latency of SSR (1.26± 0.11 ms) in patients with major depression. This result demonstrates a relation between SSR and ECT in patients with major depression. However there was no significant difference in SSR latency between patients (pre-ECT and post-ECT) and controls (1.22±0.08 ms). There was no statistically difference also in SSR amplitude among three groups. Conclusion: Data reported in this article support that activation of sympathetic system by ECT treatment does not have a major efficacy in patients with major depression. More studies are needed to evaluate the effects of depression treatment with ECT on SSR.