The present invention relates to a radioactive iodine labeled pyrido[1,2-a]benzimidazole derivative compound represented by a certain general formula, or the salt thereof; and also relates to a radioactive medicament comprising the compound.本發明係關於一種以既定通式所示之放射性碘標記吡啶并[1,2-a]苯并咪唑衍生物化合物或其鹽,並關於包含該化合物的放射性藥物。