August 2018 is the 18th month that the Nintendo Switch has been available for in Japan. During the latest month the gap grew in favor of the Switch in Japan when compared to the PlayStation 4 by 137,215 and by 1.65 million units in the last 12 months. The PlayStation 4 is currently ahead the Switch by 2.03 million units.
The PlayStation 4 launched in February 2014 in Japan, while the Nintendo Switch launched in March 2017. The Switch has sold 4.98 million units, while the PlayStation 4 sold 7.01 million units during the same timeframe.