An adapter for changing pitch of a connector, and a method of manufacturing the same, in which a first pin part and a second pin part, which are electrically connected, are formed at both end portions of a housing forming an exterior appearance of an adapter, so that it is possible to remove a wire harness and the like, which occupies a large volume in existing adapters, and so that it is possible to miniaturize a product by forming an integrated adapter by using fewer components, and to innovatively reduce production costs compared to existing adapter products.