We present a case with left frontal lobe epilepsy with focal aware seizure with eyes and head version to the right. MRI suggested a focal cortical dysplasia (FCD) in the left pre-central sulcus. EEG showed neither interictal spikes nor EEG change during habitual seizures. MEG detected interictal spikes without concurrent EEG spikes. Source of MEG spikes was estimated near the left frontal lesion. After resection of the left frontal lesion, the patient became seizure free. Histopathological diagnosis was FCD type II. In this case, MEG was helpful to construct a unitary hypothesis of the left frontal lobe epilepsy due to FCD.