The Taoiseach says he will be actively campaigning in favour of the referendum on gay marriage.
But Enda Kenny says he doesn't consider the issue to be as important as his colleague, Eamon Gilmore.
The Tánaiste has said giving full marital rights to gay people is the single biggest civil rights issue of this generation – but the Taoiseach said while important, it is not his greatest priority.
"I wouldn't have the same opinion as the Tánaiste," Kenny said. "Don't get me wrong - I support it and I'll canvass for it when it comes. But for me, the single biggest issue is our jobs and employment."
The gay and lesbian equality network, GLEN, welcomed the Taoiseach's announcement of support, saying the growing level of political support mirrored that of the general public.