Up to 40% of cases of Parkinson's disease are associated with the occurrence of depression. The symptoms of the patients' depressive state may be factors such as significant weight change, insomnia or hypersomnia, psychomotor retardation, fatigue or loss of energy, feelings of worthlessness or inappropriate guilt, decreased concentration and indecisiveness, and recurrent thoughts of death or suicidal ideation. Given these conditions, drugs prove ineffective in many cases. Electroconvulsive therapy (ECT) has been reported to be beneficial in cases of drug-resistant depression. ECT has also been applied to Parkinsonian patients with depression and found to be effective with both depression and the Parkinsonian symptom. Transcranial magnetic stimulation(TMS) has recently been investigated for application in cases of depression and has become known as a valuable tool for depression therapy. TMS is easily implemented even in outpatient therapy. TMS will make a great contribution to the therapy of depression with Parkinson's disease.