Is Nishitokyo Priced Like the 23 Wards? — Kodaira & Koganei Transaction Prices [Ep.13·2026]

※ This article is for informational purposes and personal analysis only—not investment, legal, tax, or immigration advice, and not a recommendation to buy or sell any property or financial product. Verify figures, rules, and market data against official sources and consult qualified professionals; you are solely responsible for your decisions. Information reflects the time of writing and may change afterward.

It is easy to assume that living right next to Tokyo’s 23 wards means similar home prices. Actual transaction data tells a different story. The most expensive of the three cities is not the one closest to central Tokyo. Even inside Nishitokyo, prices vary significantly by neighborhood — and on city averages alone, Koganei sits above Nishitokyo (2025 transaction data).

This article compares Nishitokyo, Kodaira, and Koganei on the same scale: price per m², converted to a standard 70 m² (~753 sq ft) unit. Ep.12 covered southern Tama — Machida, Tama City, and Inagi — and this time we shift to Tokyo’s western urban fringe: Nishitokyo (西東京), Kodaira (小平), and Koganei (小金井). Once again, going down to the neighborhood level changes the story a little.

Key Takeaways

• Koganei: ¥756k/m² > Nishitokyo: ¥559k/m² > Kodaira: ¥511k/m²
• Rail connections explain price differences better than simple proximity.
• Musashi-Koganei reaches Shinjuku directly in about 28 minutes, while Hibarigaoka takes about 40 minutes with one transfer.

Why Write This

At first I, too, assumed Nishitokyo would be the most expensive — “it sits right against the city center.” Then I lined up the transaction data. The order was different. So this article asks whether rail connections explain prices better than distance. The question was one: proximity, or rail connections?

1. How Close Are Nishitokyo Prices to Nerima and Suginami?

The article title asks about the 23 wards — so why name Nerima and Suginami? Because those are the western outer wards Nishitokyo actually touches on the map. Before talking about all 23 at once, it helps to put numbers next to the nearest neighbors. “Close in price” here does not mean adjacent on a map; it means how similar the average transaction price per m² is to those neighboring wards.

On the same basis (2025 transaction data · per m² · 70 m² conversion):

Short answer. Nishitokyo’s city average is about ¥173,000 per m² (~24%) below Nerima, and about ¥372,000 (~40%) below Suginami. Versus the 23-ward weighted average, it sits near half. Neighboring on the map does not make “priced like the 23 wards” a fair claim. Neighborhood gaps inside the city come later.

2. Are Kodaira and Koganei the Same Commute Shed?

Rail connections explained prices better than proximity

By name alone, the three cities are easy to bundle into one belt. The data do not. City averages and the morning commute in one table:

The city with the strongest “edge of the center” image is not on top. Koganei runs about 35% higher per m² than Nishitokyo; Nishitokyo about 9% higher than Kodaira. Koganei (Chuo Line) reaches Shinjuku in about 28 minutes with no transfer; Nishitokyo and Kodaira (Seibu axis) add a transfer or walking friction. Relative prices (Koganei > Nishitokyo > Kodaira) track that pattern more closely.

The Chuo Line also stayed in the upper tier of SUUMO’s 2025 Greater Tokyo “lines people want to live on” survey (4th · 410 points). That alone cannot explain prices, but steady line preference is worth noting. (line ranking)

Back to the opening question. Proximity, or rail connections? In this data, a little more weight falls on the connections.

3. Do Population and Income Tell the Same Story as Prices?

Population outlook and income density for the same three cities:³

The rank order matches prices: Koganei leads on both population growth and income density; Kodaira sits lowest. Yet all three sit below the Tokyo-municipalities average (~¥2.077M/person), and Koganei’s income density (¥1.742M) is close to Nerima’s (~¥1.727M) even though Koganei’s city-average prices are lower. Population and income do not contradict the price order — but they also do not prove “next to the center, so similar.” Read them as supporting context beside the direct-service story above.

4. How Large Are Neighborhood Gaps Inside Each City?

City averages alone do not show each city’s face. Neighborhoods with 30+ transactions look like this:

In Koganei, Honchō lifts the average; in Kodaira, the south of Hana-Koganei does. Inside Nishitokyo, Yatochō and Tanashichō already sit far apart. The three cities are hard to treat as one market — after the city name, ask which neighborhood.

Same Data, Different Readings

“It borders the center, so Nishitokyo is still the safest bet.”

Proximity can be a real living-area advantage. On these transaction averages, though, the top of the pricing hierarchy is Koganei. Tie distance and market price into one phrase, and you leave the table behind.

“Chuo Line means expensive, always.”

The Musashi-Koganei direct ride and the Honchō sample are strong. But Koganei also has thin-deal neighborhoods we did not assert with numbers. This article is not saying a line name is enough to buy a whole city.

Who This Helps / Who It Does Not

Who this helps

• Readers priced out of the 23 wards who are looking at the Tama edge of the city
• Readers who want proximity and direct service separated in a table
• Readers ready to go one step past city averages into neighborhood and station

Who it does not

• Anyone deciding a specific station or neighborhood purchase from this article alone
• Anyone reading sub-30-deal neighborhood figures as settled market prices
• Anyone looking for Nerima/Suginami neighborhood-level prices here (city averages only)

Joseph’s View

Even next to the 23 wards on the map, what sorted relative prices was the direct rail connection — and the neighborhood.

Closing this piece — the question I held onto was proximity, or rail connections? The number that stayed longest was Koganei’s “28 minutes with no transfer.”

In this data, the character of the rail connection into the center explained prices better than distance to the center. I will stay inside that scope.

A reading I intend to keep — after the city name, ask which station, how many transfers, which neighborhood’s deals. Proximity is a fact on the map. But market prices are a story the rail connection and the neighborhood write together.

Previous and Next in the Series

• Ep.12: Has Tama New Town Really Failed? — Machida, Tama & Inagi
• Ep.11: Hachioji, Hino, and Akishima — Western Tama
• Ep.10: Kokubunji, Kunitachi, Fuchu, and Tachikawa
• Series Prologue