The patient was a 25-year-old male with acute multifocal motor neuropathy with conduction block (MMNCB) after Campylobacter jejuni enteritis. After having suffered from diarrhea for 3 days, he rapidly developed asymmetrical distal-dominant muscle weakness in all extremities. Sensory disturbance was unremarkable except for slight disturbance in deep sensation. Deep tendon reflexes were normal throughout the course of present illness. CSF analysis revealed increased protein up to 66 mg/dl without pleocytosis. In electrophysiological examinations, persistant multifocal conduction blocks in the motor nerves were predominantly noted in the distal part of the extremities. Serum titers of anti-Campylobacter jejuni antibody, anti-GM1 antibody and anti-GalNAc-GD1a antibody were elevated. Muscle weakness resolved completely within 7 weeks. The sural nerve biopsy did not reveal either axonal degeneration, nor demyelination. These clinical and laboratory findings suggested that this case was most likely an acute type of MMNCB after Campylobacter jejuni enteritis.