How much does yam (nagaimo) cost in Japan?

¥849 per kg, as of September 2026 — the unweighted average of 81 surveyed cities in the government's retail price survey.

Which Japanese city has the cheapest yam (nagaimo)?

Among the surveyed cities in September 2026, Asahikawa was cheapest at ¥655 and Morioka the most expensive at ¥1,092.

How much have yam (nagaimo) prices changed in Japan over the past year?

As of September 2026, -2.8% year on year, measured by Japan's official consumer price index (2020 = 100).

How much have yam (nagaimo) prices changed in Japan over the past five years?

+28.7% compared with the same month five years earlier. The index now reads 122.9.

When were yam (nagaimo) prices in Japan at their highest?

The series peaked at 144.1 in October 1994. The latest reading is -14.7% against that peak.

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).

Food · code 1420

Yam (nagaimo) price in Japan

ながいも

Average retail price

¥849per kg-3.0% year on year

2026-09 · unweighted average of 81 surveyed cities

Cheapest surveyed city: ¥655 Asahikawa
Priciest surveyed city: ¥1,092 Morioka

Price in your city:

¥952per kg+12.1% vs national average#45 cheapest of 52 cities

See all 52 cities, cheapest first

#	City	Price (JPY) · per kg
1	Kanazawa	¥682
2	Akita	¥727
3	Kagoshima	¥732
4	Sapporo	¥747
5	Niigata	¥752
6	Aomori	¥759
7	Nagano	¥759
8	Fukushima	¥778
9	Maebashi	¥792
10	Nara	¥796
11	Oita	¥811
12	Yamagata	¥815
13	Toyama	¥815
14	Takamatsu	¥816
15	Nagasaki	¥820
16	Kitakyushu	¥820
17	Gifu	¥837
18	Yamaguchi	¥837
19	Sendai	¥840
20	Fukui	¥841
21	Kyoto	¥842
22	Tokushima	¥843
23	Kumamoto	¥850
24	Sagamihara	¥850
25	Nagoya	¥859
26	Okayama	¥860
27	Matsuyama	¥867
28	Hiroshima	¥871
29	Tsu	¥872
30	Utsunomiya	¥876
31	Saga	¥877
32	Saitama	¥883
33	Matsue	¥885
34	Kochi	¥892
35	Miyazaki	¥896
36	Kobe	¥897
37	Sakai	¥899
38	Hamamatsu	¥907
39	Osaka	¥922
40	Otsu	¥923
41	Shizuoka	¥928
42	Fukuoka	¥930
43	Yokohama	¥931
44	Kawasaki	¥947
45	Tokyo (23 wards)	¥952
46	Kofu	¥959
47	Chiba	¥960
48	Wakayama	¥961
49	Tottori	¥976
50	Naha	¥1,000
51	Mito	¥1,001
52	Morioka	¥1,092

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

Yam (nagaimo) costs ¥849 per kg in Japan as of September 2026 — the unweighted average of 81 surveyed cities, down 3.0% from a year earlier. Measured as an index, the official CPI for yam (nagaimo) reads 122.9 (2020 = 100) in September 2026, down 2.8% year on year and up 28.7% over five years.

Yam (nagaimo) sits in the food group of Japan's CPI basket, with 561 monthly observations from January 1980 to September 2026. The series peaked at 144.1 in October 1994 and bottomed at 50.8 in April 1980; the latest reading is -14.7% against that peak. Against ten years ago it is +16.2%.

Latest CPI

122.9

2026-09 (2020=100)

YoY %

-2.8%

5y change %

+28.7%

Change since 1980-01

+126.3%

Annual average index by year

Annual average consumer price index for Yam (nagaimo) in Japan (2020 = 100)
Year	Index	YoY %	Months
2015	97.5	-0.3%	12
2016	103.3	+5.9%	12
2017	126.7	+22.7%	12
2018	109.1	-13.9%	12
2019	103.1	-5.5%	12
2020	100.1	-2.9%	12
2021	95.5	-4.6%	12
2022	94.1	-1.5%	12
2023	112.4	+19.4%	12
2024	114.9	+2.2%	12
2025	121.8	+6.0%	12
2026	120.9	-0.7%	9

Average of the monthly index values in each year (2020 = 100). Blank months are excluded.

Average retail price by month

2026-09	¥849
2026-08	¥835
2026-07	¥821
2026-06	¥816
2026-05	¥807
2026-04	¥825
2026-03	¥833
2026-02	¥849
2026-01	¥867
2025-12	¥900
2025-11	¥908
2025-10	¥897
2025-09	¥876

Frequently asked questions

How much does yam (nagaimo) cost in Japan?: ¥849 per kg, as of September 2026 — the unweighted average of 81 surveyed cities in the government's retail price survey.
Which Japanese city has the cheapest yam (nagaimo)?: Among the surveyed cities in September 2026, Asahikawa was cheapest at ¥655 and Morioka the most expensive at ¥1,092.
How much have yam (nagaimo) prices changed in Japan over the past year?: As of September 2026, -2.8% year on year, measured by Japan's official consumer price index (2020 = 100).
How much have yam (nagaimo) prices changed in Japan over the past five years?: +28.7% compared with the same month five years earlier. The index now reads 122.9.
When were yam (nagaimo) prices in Japan at their highest?: The series peaked at 144.1 in October 1994. The latest reading is -14.7% against that peak.
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).