We report a case of aphasia after neck clipping of a ruptured aneurysm at the origin of the duplicated middle cerebral artery(DMCA). A 60-year-old woman had a sudden onset of headache and nausea. A computed tomography(CT)scan revealed diffuse subarachnoid hemorrhage. Head three-dimensional CT angiography(3D-CTA)showed a left DMCA with a saccular aneurysm at the origin. She became aphasic on the third day after aneurysmal neck clipping. A CT scan revealed a low-density area in the anterior portion of the left temporal lobe, which is perfused by the DMCA. The DMCA was patent on 3D-CTA, but the angle between the ICA and the DMCA changed steep. It is suspected that the clip changed the branching angle at the DMCA origin, which may have led to decreased blood flow in the DMCA. She received linguistic rehabilitation for dysnomia and was discharged with slight difficulty in naming objects. Six months later, she recovered from the aphasia. One year later, the DMCA was patent on 3D-CTA. We should pay attention to ischemic complications in clipping because DMCAs are easily deformed.