{"updated": "2026-09-19", "item": "マスク", "unit": "1袋･7枚", "item_code": "6102", "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": 1.045, "from": {"month": "2020-01", "yen": 376}, "to": {"month": "2026-07", "yen": 393}, "months": [{"month": "2020-01", "yen": 376}, {"month": "2020-02", "yen": 383}, {"month": "2020-07", "yen": 382}, {"month": "2020-08", "yen": 372}, {"month": "2020-09", "yen": 362}, {"month": "2020-10", "yen": 328}, {"month": "2020-11", "yen": 345}, {"month": "2020-12", "yen": 327}, {"month": "2021-01", "yen": 327}, {"month": "2021-02", "yen": 327}, {"month": "2021-03", "yen": 346}, {"month": "2021-04", "yen": 344}, {"month": "2021-05", "yen": 355}, {"month": "2021-06", "yen": 357}, {"month": "2021-07", "yen": 366}, {"month": "2021-08", "yen": 382}, {"month": "2021-09", "yen": 382}, {"month": "2021-10", "yen": 382}, {"month": "2021-11", "yen": 382}, {"month": "2021-12", "yen": 382}, {"month": "2022-01", "yen": 378}, {"month": "2022-02", "yen": 382}, {"month": "2022-03", "yen": 378}, {"month": "2022-04", "yen": 373}, {"month": "2022-05", "yen": 373}, {"month": "2022-06", "yen": 373}, {"month": "2022-07", "yen": 375}, {"month": "2022-08", "yen": 373}, {"month": "2022-09", "yen": 382}, {"month": "2022-10", "yen": 372}, {"month": "2022-11", "yen": 380}, {"month": "2022-12", "yen": 371}, {"month": "2023-01", "yen": 382}, {"month": "2023-02", "yen": 382}, {"month": "2023-03", "yen": 383}, {"month": "2023-04", "yen": 401}, {"month": "2023-05", "yen": 428}, {"month": "2023-06", "yen": 431}, {"month": "2023-07", "yen": 432}, {"month": "2023-08", "yen": 434}, {"month": "2023-09", "yen": 434}, {"month": "2023-10", "yen": 434}, {"month": "2023-11", "yen": 429}, {"month": "2023-12", "yen": 429}, {"month": "2024-01", "yen": 424}, {"month": "2024-02", "yen": 428}, {"month": "2024-03", "yen": 428}, {"month": "2024-04", "yen": 428}, {"month": "2024-05", "yen": 436}, {"month": "2024-06", "yen": 437}, {"month": "2024-07", "yen": 437}, {"month": "2024-08", "yen": 437}, {"month": "2024-09", "yen": 437}, {"month": "2024-10", "yen": 437}, {"month": "2024-11", "yen": 437}, {"month": "2024-12", "yen": 447}, {"month": "2025-01", "yen": 431}, {"month": "2025-02", "yen": 431}, {"month": "2025-03", "yen": 427}, {"month": "2025-04", "yen": 427}, {"month": "2025-05", "yen": 427}, {"month": "2025-06", "yen": 422}, {"month": "2025-07", "yen": 422}, {"month": "2025-08", "yen": 422}, {"month": "2025-09", "yen": 427}, {"month": "2025-10", "yen": 428}, {"month": "2025-11", "yen": 427}, {"month": "2025-12", "yen": 420}, {"month": "2026-01", "yen": 400}, {"month": "2026-02", "yen": 387}, {"month": "2026-03", "yen": 394}, {"month": "2026-04", "yen": 396}, {"month": "2026-05", "yen": 388}, {"month": "2026-06", "yen": 391}, {"month": "2026-07", "yen": 393}]}