Nickel　catalysts　are　effective　for　the　steam　reforming　of　tar　derived　from　biomass　pyrolysis,　but　the　improvement　is　needed　in　terms　of　activity,　stability,　suppression　of　coke　deposition　and　aggregation,　and　regeneration.　Our　recent　development　of　Ni-based　catalysts　for　the　steam　reforming　of　tar　is　reviewed　including　the　modification　with　CeO2　(or　MnO),　trace　Pt,　and　MgO.　The　role　of　additives　such　as　CeO2,　MnO,　Pt,　and　MgO　is　also　discussed.