Mr Abe is the second foreign leader Mr Trump has met since becoming US president in January
After talks at the White House, Mr Trump said the US was committed to “the security of Japan”.
Echoing his words, Mr Abe also stressed on the importance of strengthening economic and trade relations.
Mr Trump had previously taken issue with the US trade deficit with Japan, threatening tariffs on carmaker Toyota.
At a joint press-conference on Friday, President Trump described Japan as “an important and steadfast ally”, adding that Washington was committed to bringing bilateral ties even closer.
He also said the two nations would continue to build up defensive capabilities in the Pacific, promoting shared interests – including freedom of navigation.