There are three main areas of the Shinjuku shopping district. The West Exit boasts major department stores and electronics retailers. To the south, you'll find trendier boutiques, while to the east is Shinjuku-dori Street, with a number of higher-end brand names.

Shinjuku is a massive "city within a city," but its "main area" is generally defined as the district immediately surrounding Shinjuku Station, the busiest railway station in the world. This area is divided into several distinct "neighborhoods" each with its own personality. East Shinjuku is the high-energy entertainment hub, home to the neon-lit streets of Kabukicho (the famous "Red Light District"), the Golden Gai’s tiny themed bars, and the massive Isetan department store. West Shinjuku (Nishi-Shinjuku) is the "Skyscraper District," characterized by grand hotels and the Tokyo Metropolitan Government Building, which offers free panoramic views of the city. To the south, the Shinjuku Southern Terrace provides a more modern, relaxed shopping and dining experience with open-air walkways. In 2026, the "Shinjuku Connect" project has further integrated these areas with improved underground passages and digital wayfinding. For first-time visitors, the area near the "Shinjuku 3-chome" intersection is often considered the heart of the action, where the massive crowds, towering 3D digital billboards (like the famous Shinjuku Cat), and endless shopping opportunities converge.