The westernmost corner of Tama New Town: tidy new condos, detached homes and Oyama-dairi Park north of Keio Tamasakai Station
Tamasakai Station is Keio's only station in Machida, with the station building straddling the tracks; buses all depart from the west exit. The area around the station, Oyamagaoka, is the westernmost planned residential district of Tama New Town, stretching long from east to west. The area north of the station is mostly new apartment buildings, large parks, and family-friendly restaurants. The neighbourhood isn't all residential either: Oyamagaoka 2-chome has an industrial park, and there are large discount stores along the main road.
A 5-minute walk from the east exit gets you to Oyama-dairi Park, a Tokyo metropolitan park of about 46 hectares, most of which is designated as a protected area closed to visitors; the open sections have grasslands, ponds, and paddy fields. Based on our street photos, greenery ranks 5th out of Tokyo's 174 neighbourhoods, the best of this neighbourhood's seven categories. The streets are also kept clean, ranking 20th for cleanliness.
Convenience for daily life ranks last among the 174 neighbourhoods. After the old shopping centre closed, the station area had only convenience stores for several years, until Keio's station-front building opened at the east exit in 2023, finally bringing a supermarket and a drugstore. Special Express and Express trains don't stop at Tamasakai—only Semi Express, Rapid and Local trains do. Based on our street photos, the buildings category also ranks last. Trash from this area is sent to a cleaning plant in Tama City, so the sorting rules differ somewhat from the rest of Machida.
The station name takes its "sakai" (meaning border) from three sources: the boundary of Tama New Town, the border between Tokyo and Kanagawa Prefecture, and the nearby Sakai River. Keio originally had no plans to put a station here; it was the Machida mayor and city council who pushed for it. As a result, it opened a year later than the Minamiosawa–Hashimoto section, finally launching in 1991. At the time this area was still called Oyama-machi, and some people had pushed for the station to be named Keio-Oyama. In 1999, a shopping centre called Across Tamasakai opened at the west exit, but it was completely closed and demolished by 2012. In 2004, this area was carved out from Oyama-machi and Aihara-machi to form Oyamagaoka. Oyama-dairi Park opened the same year. The trail that follows the ridge line in the park was originally a road used by the army arsenal to test tanks during World War II.
Compared with the 174 Tokyo neighbourhoods in this guide (scores 0–10)
76 blocks · Curated boundary · Data version 2026-10-04
Compared against the Tokyo neighbourhoods in this guide; metrics without enough data are not ranked. Shopping counts convenience stores plus the nearer of a supermarket or a traditional market (public and private retail markets); night markets, vendor zones and shopping-street shops are not counted. Transit is rail-first with a lower weight for buses.
TidyMap rates the street environment and everyday convenience. It does not assess the home itself, safety, noise or actual living experience. About data limits
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TidyMap rates the street environment and everyday convenience. It does not assess the home itself, safety, noise or actual living experience. Street environment scores use AI assessments of imagery; convenience scores use public facility data.
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