{"updated": "2026-09-19", "item": "ロールケーキ", "unit": "1本", "item_code": "1715", "source": "総務省統計局 小売物価統計調査（動向編）", "source_url": "https://www.stat.go.jp/data/kouri/", "license": "CC BY 4.0（数値）", "method": "81市の調査価格の月ごとの中央値。40市以上で値がある月だけ", "comparable": true, "ratio": 1.294, "from": {"month": "2020-01", "yen": 1159}, "to": {"month": "2026-07", "yen": 1500}, "months": [{"month": "2020-01", "yen": 1159}, {"month": "2020-02", "yen": 1159}, {"month": "2020-03", "yen": 1159}, {"month": "2020-04", "yen": 1138}, {"month": "2020-05", "yen": 1143}, {"month": "2020-06", "yen": 1152}, {"month": "2020-07", "yen": 1117}, {"month": "2020-08", "yen": 1117}, {"month": "2020-09", "yen": 1152}, {"month": "2020-10", "yen": 1152}, {"month": "2020-11", "yen": 1152}, {"month": "2020-12", "yen": 1152}, {"month": "2021-01", "yen": 1152}, {"month": "2021-02", "yen": 1152}, {"month": "2021-03", "yen": 1152}, {"month": "2021-04", "yen": 1152}, {"month": "2021-05", "yen": 1160}, {"month": "2021-06", "yen": 1169}, {"month": "2021-07", "yen": 1160}, {"month": "2021-08", "yen": 1160}, {"month": "2021-09", "yen": 1160}, {"month": "2021-10", "yen": 1160}, {"month": "2021-11", "yen": 1160}, {"month": "2021-12", "yen": 1160}, {"month": "2022-01", "yen": 1172}, {"month": "2022-02", "yen": 1188}, {"month": "2022-03", "yen": 1192}, {"month": "2022-04", "yen": 1218}, {"month": "2022-05", "yen": 1196}, {"month": "2022-06", "yen": 1199}, {"month": "2022-07", "yen": 1206}, {"month": "2022-08", "yen": 1208}, {"month": "2022-09", "yen": 1218}, {"month": "2022-10", "yen": 1242}, {"month": "2022-11", "yen": 1242}, {"month": "2022-12", "yen": 1233}, {"month": "2023-01", "yen": 1232}, {"month": "2023-02", "yen": 1206}, {"month": "2023-03", "yen": 1242}, {"month": "2023-04", "yen": 1258}, {"month": "2023-05", "yen": 1258}, {"month": "2023-06", "yen": 1250}, {"month": "2023-07", "yen": 1264}, {"month": "2023-08", "yen": 1264}, {"month": "2023-09", "yen": 1296}, {"month": "2023-10", "yen": 1296}, {"month": "2023-11", "yen": 1332}, {"month": "2023-12", "yen": 1296}, {"month": "2024-01", "yen": 1337}, {"month": "2024-02", "yen": 1368}, {"month": "2024-03", "yen": 1337}, {"month": "2024-04", "yen": 1368}, {"month": "2024-05", "yen": 1373}, {"month": "2024-06", "yen": 1386}, {"month": "2024-07", "yen": 1366}, {"month": "2024-08", "yen": 1368}, {"month": "2024-09", "yen": 1386}, {"month": "2024-10", "yen": 1404}, {"month": "2024-11", "yen": 1404}, {"month": "2024-12", "yen": 1400}, {"month": "2025-01", "yen": 1400}, {"month": "2025-02", "yen": 1400}, {"month": "2025-03", "yen": 1400}, {"month": "2025-04", "yen": 1417}, {"month": "2025-05", "yen": 1433}, {"month": "2025-06", "yen": 1433}, {"month": "2025-07", "yen": 1496}, {"month": "2025-08", "yen": 1433}, {"month": "2025-09", "yen": 1433}, {"month": "2025-10", "yen": 1427}, {"month": "2025-11", "yen": 1427}, {"month": "2025-12", "yen": 1467}, {"month": "2026-01", "yen": 1467}, {"month": "2026-02", "yen": 1467}, {"month": "2026-03", "yen": 1472}, {"month": "2026-04", "yen": 1472}, {"month": "2026-05", "yen": 1529}, {"month": "2026-06", "yen": 1500}, {"month": "2026-07", "yen": 1500}]}