The ship, named the Izumo, is classified as a helicopter destroyer, though its flattop design makes it look like an aircraft carrier.
But the Japanese Defense Ministry says the ship is not intended to be used as an aircraft carrier and will not be used to launch fighter jets, state broadcaster NHK reported.
The launch of the $1.2 billion warship at a Yokohama dockyard comes at a time of increased military tensions between Japan and China over disputed islands in the East China Sea.
“The destroyer is aimed at better responding to various contingencies in waters near Japan,” NHK reported.
China on Tuesday warned Japan against any moves of military expansion, according to a report from Global Times.