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[PURPOSE] The purpose of this case report was to investigate the effects of the Schroth exercise on Cobb's angle, thoracic and lumbar hump tilt, hip joint internal rotation and external rotation in idiopathic scoliosis patients with 4-curve type. [METHODS] The subjects included 15-year-old female patients (n = 3) who had diagnosed with idiopathic scoliosis according to radiographic findings in Cobb's angle of 10 degrees or more. They performed the Schroth exercise for 140 minutes per day and 3 times per week, for 12 weeks. [RESULTS] Cobb's angle of thoracic spine was decreased by 17.9% (case 1), 10.0% (case 2) and 17.7% (case 3) after the Schroth exercise compared with before exercise. Cobb's angle of the lumbar spine was also decreased by 22.3% (case 1), 19.2% (case 2) and 24.2% (case 3) after the Schroth exercise respectively. Thoracic hump tilt was changed by 0% (case 1), 27.3% (case 2) and 18.2% (case 3) after Schroth exercise. Lumbar hump tilt was not changed or improved to 66.7% (case 1), 40.0% (case 2) and 33.4% (case 3) after the Schroth exercise respectively. ROM of hip joint internal rotation was increased by 7.1% (left of case 1), 5.4% and 29.0% (left and right case 2), and 10.5% and 2.5% (left and right case 3) after the Schroth exercise respectively. ROM of hip joint external rotation was also increased by 5.4% and 5.7% (left and right case 1), 15.0% (left case 2), and 40.7 % and 33.3% (left and right case 3) after the Schroth exercise respectively. [CONCLUSIONS] These results suggest that the Schroth exercise improves Cobb‘s angle, thoracic and lumbar hump tilt and hip joint ROM in idiopathic scoliosis patients with 4-Curve type, but there were large individual differences. Therefore, it is suggestive that the individual difference should be considered for the Schroth exercise in scoliosis patients.