BudgetGuessr rankings

The most expensive megaprojects from Japan in our catalogue

The 30 most expensive of 37 built and under-construction megaprojects in Japan in the BudgetGuessr catalogue, ranked by documented cost in US dollars.

1
Chūō Shinkansen
2025 · Railway$73.5 billionUnder constructionEstimate$73.5 billionUnder constructionEstimate¥11000 billion · Published project estimate
2
Honshu-Shikoku Bridge Project
1999 · Bridge$25.2 billion$25.2 billion¥2870 billion · Final project cost
3
Kansai International Airport
1994 · Airport$15.29 billion$15.29 billion¥1562.3 billion · Reported project cost
4
Toei Ōedo Line
2000 · Railway$12.6 billion$12.6 billion¥1357.4 billion · Final project cost
5
Seikan Tunnel
1988 · Tunnel$5.38 billion$5.38 billion¥690 billion · Final project cost
6
Rinkai Line
2002 · Railway$3.53 billion$3.53 billion¥442.6 billion · Reported project cost
7
Tokyo — Fukutoshin Line
2008 · Railway$2.33 billion$2.33 billion¥240.4 billion · Final project cost
8
Tokyo — Yurikamome
1995 · Railway$1.81 billion$1.81 billion¥170.2 billion · Final project cost
9
Keisei Narita Airport Line
2010 · Railway$1.44 billion$1.44 billion¥126.1 billion · Reported project cost
10
Osaka — Higashi Line
2019 · Railway$1.14 billion$1.14 billion¥124.3 billion · Reported project cost
11
Tokaido Shinkansen
1964 · Railway$1.06 billion$1.06 billion¥380 billion · Approved budget
12
Osaka — Monorail — Monorail extension
2024 · Railway$948.69 millionUnder constructionEstimate$948.69 millionUnder constructionEstimate¥143.6 billion · Published project estimate
13
Abeno Harukas
2014 · Skyscraper$679.39 million$679.39 million¥80 billion · Original budget
14
Midland Square
2006 · Skyscraper$670.68 million$670.68 million¥78 billion · Reported project cost
15
SiS Rinku Tower
1996 · Skyscraper$605.82 million$605.82 million¥65.9 billion · Reported project cost
16
NEC Supertower
1990 · Skyscraper$414.39 million$414.39 million¥60 billion · Reported project cost
17
Toyota Stadium
2001 · Stadium$371.1 million$371.1 million¥45.1 billion · Final project cost
18
Ueno-Tokyo Line
2015 · Railway$330.46 millionEstimate$330.46 millionEstimate¥40 billion · Published project estimate
19
Ajinomoto Stadium
2001 · Stadium$284.88 million$284.88 million¥30.7 billion · Final project cost
20
Tokyo Dome
1988 · Stadium$273.11 million$273.11 million¥35 billion · Reported project cost
21
Asakusa Line
1960 · Railway$240 million$240 million¥86.4 billion · Reported project cost
22
Ōita Stadium
2001 · Stadium$206.54 million$206.54 million¥25.1 billion · Reported project cost
23
Tsunoshima Bridge
2000 · Bridge$138.26 million$138.26 million¥14.9 billion · Final project cost
24
Kyoto Stadium
2025 · Stadium$117.6 million$117.6 million¥17.6 billion · Reported project cost
25
Suita Stadium
2015 · Stadium$115.66 million$115.66 million¥14 billion · Reported project cost
26
Kumagaya Rugby Stadium
2018 · Stadium$112.31 million$112.31 million¥12.402 billion · Approved budget
27
Sōyamisaki Wind Farm
2005 · Energy$108.87 million$108.87 million¥12 billion · Reported project cost
28
Yurihonjo Arena
2018 · Stadium$97.81 million$97.81 million¥10.8 billion · Reported project cost
29
Matsumotodaira Football Stadium
2001 · Stadium$92.98 million$92.98 million¥11.3 billion · Reported project cost
30
Tosu Stadium
1996 · Stadium$89.17 million$89.17 million¥9.7 billion · Final project cost

How this ranking works

This is a curated catalogue, not an exhaustive list of every megaproject. Projects are ordered by their recorded US-dollar equivalent; each detail page shows the source amount and any currency conversion. Figures are not adjusted for inflation, and construction bills, estimates, and programme costs can have different scopes. Unbuilt proposals and cancelled projects are excluded.

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