Reflex seizures induced by micturition are rare, and there have been few reports on ictal electroencephalogram (EEG) findings. Here, we report a 7-year-old boy with secondarily generalized partial seizures induced by micturition. The seizures occurred every time he urinated. A few seconds after micturition begun, he toppled down with hand automatism followed by a secondarily generalized tonic posture and loss of consciousness. Ictal video-EEG recording during urination was performed. An ictal EEG demonstrated a polyspike wave discharge onset from the left frontotemporal region, with rapid spread to the right frontotemporal region. He was treated with the antiepileptic drug valproate sodium, which improved seizure control. He remained seizure-free until the last followup for a period of 2 years.