Big Ben of Tokyo

The NTT Docomo Yoyogi Building (NTTドコモ代々木ビル, Enutiti Dokomo Yoyogi Biru^?) is a skyscraper located in the Shibuya in Tokyo, Japan. At 240 metres (790 ft) tall, it is the third tallest building in Tokyo. After the installation of a clock in 2002, the building became the tallest clock tower in the world.

The NTT Docomo Yoyogi Building is owned by the NTT Docomo group. Despite the building's name, it is not the head office for the company, whose headquarters are located in the top floors of the Sannō Park Tower. The building houses some offices, but is mainly used to house technical equipment (switching equipment, etc.) for the company's cellular telephone service.

To commemorate NTT Docomo's 10th anniversary, a 15-metre-diameter clock was put into operation in November 2002. The installation of this clock made the building the tallest clock tower in the world, surpassing the Palace of Culture and Science in Warsaw, which had added a clock in 2000. The upper portion of the building also features colored lights that indicates if the weather forecast calls for rain on that day.