Up against a side who they had lost two of their past three matches against, New Zealand produced a statement-making performance.
They ran in three first-half tries to hold an imposing 22-0 lead at halftime, before adding four more in the second to book their semifinal berth.
The All Blacks will face England at Yokohama next Saturday for a place in a third consecutive World Cup final.
Ireland, meanwhile, head home having extended their streak of having never won a knockout match in World Cup history.