noun
shopping area inside a train station
Refers to commercial facilities located within the ticket gates of a railway station, such as shops, restaurants, and services. A relatively modern term that became common with the expansion of station retail.
駅ナカのカフェで時間をつぶした。
I killed time at a café inside the station.
最近、駅ナカに新しいスイーツ店ができた。
A new sweets shop recently opened inside the station.
駅ビル refers to a station building that often includes shops, but it can be outside the ticket gates or attached to the station. 駅ナカ specifically means inside the paid area.
駅前 means the area in front of the station, typically outside the station building. 駅ナカ is inside the station, behind the ticket gates.
Compound of 駅 (eki, 'station') and 中 (naka, 'inside'), with the latter often written in katakana as ナカ for emphasis or stylistic reasons. The term gained popularity in the 2000s with the expansion of station retail spaces.