Castella sponge cake
Average retail price
- Cheapest surveyed city
- ¥124 Morioka
- Priciest surveyed city
- ¥436 Hiroshima
Retail price survey conducted by the Statistics Bureau of Japan. This is a survey average, not a shop price — actual prices vary by store. 総務省統計局 小売物価統計調査 · Surveyed items and specifications
Key facts
Castella sponge cake costs ¥250 per 100 g in Japan as of August 2026 — the unweighted average of 47 surveyed cities, up 4.0% from a year earlier. Measured as an index, the official CPI for castella sponge cake reads 135.8 (2020 = 100) in August 2026, up 4.5% year on year and up 35.7% over five years.
Castella sponge cake sits in the food group of Japan's CPI basket, with 680 monthly observations from January 1970 to August 2026. The series peaked at 135.8 in August 2026 and bottomed at 26.2 in January 1970; the latest reading is at its highest recorded level. Against ten years ago it is +36.9%.
Annual average index by year
| Year | Index | YoY % | Months |
|---|---|---|---|
| 2015 | 98.9 | +2.6% | 12 |
| 2016 | 98.9 | 0.0% | 12 |
| 2017 | 97.3 | -1.6% | 12 |
| 2018 | 97.6 | +0.3% | 12 |
| 2019 | 98.8 | +1.2% | 12 |
| 2020 | 100.0 | +1.2% | 12 |
| 2021 | 100.6 | +0.6% | 12 |
| 2022 | 104.1 | +3.5% | 12 |
| 2023 | 113.6 | +9.1% | 12 |
| 2024 | 123.5 | +8.7% | 12 |
| 2025 | 129.6 | +4.9% | 12 |
| 2026 | 132.8 | +2.5% | 8 |
Average of the monthly index values in each year (2020 = 100). Blank months are excluded.
Average retail price by month
| 2026-08 | ¥250 |
|---|---|
| 2026-07 | ¥248 |
| 2026-06 | ¥247 |
| 2026-05 | ¥245 |
| 2026-04 | ¥246 |
| 2026-03 | ¥244 |
| 2026-02 | ¥244 |
| 2026-01 | ¥244 |
| 2025-12 | ¥241 |
| 2025-11 | ¥239 |
| 2025-10 | ¥241 |
| 2025-09 | ¥240 |
| 2025-08 | ¥241 |
Frequently asked questions
- How much does castella sponge cake cost in Japan?
- ¥250 per 100 g, as of August 2026 — the unweighted average of 47 surveyed cities in the government's retail price survey.
- Which Japanese city has the cheapest castella sponge cake?
- Among the surveyed cities in August 2026, Morioka was cheapest at ¥124 and Hiroshima the most expensive at ¥436.
- How much have castella sponge cake prices changed in Japan over the past year?
- As of August 2026, +4.5% year on year, measured by Japan's official consumer price index (2020 = 100).
- How much have castella sponge cake prices changed in Japan over the past five years?
- +35.7% compared with the same month five years earlier. The index now reads 135.8.
- When were castella sponge cake prices in Japan at their highest?
- Right now. The latest month, August 2026, is the highest reading in the series at 135.8 — a record high since the series began.
- What is the difference between the index and the yen price?
- This page carries two kinds of number. The index (2020 = 100) measures percentage change over time and is not a yen amount; the yen figure is an actual average retail price from the government's retail price survey. Source: 総務省統計局 消費者物価指数 (e-Stat table 0003427113, nationwide, monthly).