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A 71-year-old man visited our clinic for severe pain in his right T11 dermatome caused by postherpetic neuralgia (PHN) that had persisted for 10 months. Several medications and interventions, including epidural or nerve root blocks, had been used in attempts to relieve his pain. Although the pain improved, the localized allodynia persisted in the anterior abdominal wall. A transversus abdominis plane block was performed between the internal oblique and transversus abdominis muscles, resulting in satisfactory and sustained analgesia. Such blocks might be a useful treatment option for pain management in cases of acute herpes zoster and PHN.