A 44-year-old male with a repeatedly ruptured dissecting aneurysm of the vertebral artery (VA) manifesting with subarachnoid hemorrhage was successfully treated with endovascular surgery using an interlocking detachable coil (IDC). He had a dissecting aneurysm in the left VA distal to the left posterior inferior cerebellar artery (PICA). Because the dissecting aneurysm ruptured repeatedly and his clinical condition was moribund, direct surgery was not indicated. The dissecting aneurysm was embolized with an IDC and additional platinum coils. Among patients with a ruptured VA dissecting aneurysm, proximal occlusion is generally indicated. But the direct embolization of a dissecting aneurysm can be applied in cases in which the aneurysm is ruptured repeatedly in the acute stage. IDC is a useful and safe material for endovascular surgery of a ruptured VA dissecting aneurysm.