The gateway explains the facility, located one minute from Terminal 2, caters for passengers taking an early morning flights, and opened on July 20.
Nine hours, the first at an airport in Japan, has been developed in a parking garage adjacent to the terminal, and sets guests back ¥3,900 (€28), and is open 24 hours a day.
They sleep in a pod about a metre wide, a metre high and two metres long, while they can also opt for shorter stays ranging from ¥1,500 (€11) per hour, and can even request a shower.
New budget airlines at Narita International are marketing domestic flights that can start as early as 6am, while train and bus access is said to be severely limited from late at night until early in the morning, when the airport is closed to air traffic.
The airport says many passengers spend the night before flying sleeping on benches in the passenger terminals.
The capsule hotel offers 71 units for men and 58 for women, and also hopes to serve passengers with connecting flights.