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A series of forearm pronation and supination motor tasks (FPSMT) has been developed to quantitatively assess various primary motor symptoms such as resting tremor, bradykinesia, rigidity, and posture disturbance using an accelerometer built into a smartphone, which is portable, comfortable and cost-effective. The FPSMT has two series of tasks, Flat and Up, which differ according to initial forearm posture. The results from 33 subjects including 6 PD patients showed sensitivities and specificities greater than 85% in rating of primary motor symptoms. This suggests that FPSMT could be used to collect forearm motor-related information on a daily basis, allowing for early diagnosis of patients with PD and also for constantly informing physicians about their patients’ clinical status so as to quickly readjust and personalize treatment plans and minimize side effects.