Until yesterday, the Canton Tower in China's Guangdong Province held the record.
Tokyo Sky Tree will reach its target height of 634 meters by the end of March. The project, which began in July 2008, will be completed in December.
It became the tallest tower in Japan in March last year after topping the 333-meter-high Tokyo Tower.
A digital terrestrial television broadcast antenna is currently being installed on the tower, which will eventually have two viewing platforms, at 350- and 450-meter points.
Tokyo Sky Tree is set to begin operations in the spring of 2012. Commercial facilities, office buildings and an aquarium are slated to be built nearby.
The tower is already attracting many visitors, who want to see it before completion, making it a new Tokyo tourist attraction
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