Global increases in salmon consumption and changes in fish-eating habits have meant that Diphyllobothrium infections now occur in regions where they were previously absent. In the present paper, a case of diphyllobothriasis through the likely ingestion of raw salmon in New Zealand in a Japanese patient is reported. The causative tapeworm species was identified as Diphyllobothrium nihonkaiense based on mitochondrial DNA analysis of proglottid expelled from the patient.