To reduce the possibility of a postdural puncture headache and subarachnoid infection, an introducer is commonly used during spinal anesthesia. Because an introducer has a larger diameter than a spinal needle, a dural puncture by made using an introducer may increase postdural puncture headache. Actually, dura mater is hard to perforate using an introducer, because mean depth to the subarachnoid space is 5.44 ± 0.47 cm in koreans but the required introducer length is only 3.2 cm. However, we experienced dural puncture by an introducer when performing spinal anesthesia and therefore report the case.