Mr Shearer took the seat vacated by Prime Minister Helen Clark with a majority of more than 9000 votes.
With all votes counted, Mr Shearer had 12,613 votes with National's Melissa Lee well behind on 3426.
Polls last week showed Mr Shearer with a massive lead over his nearest opponent National's Melissa Lee with Green Party co-leader Russel Norman in third and today's results confirmed the mood of the Auckland electorate.
Labour had feared apathy could eat into their lead and that the Greens could woo some of their voters away.
However, Dr Norman was still beaten into third place on 2418 and ACT's John Boscawen was fourth on 943.
Labour poured resources into the campaign as any other than a healthy victory would have hit the morale of the party hard as it tries to recover from last year's election victory.
National went into the campaign with high hopes that the recent campaign victory, continuing nationwide popularity and the sometimes quirky nature of by-elections might give them a chance of an upset.
However, Ms Lee made a series of gaffes and ill-judged comments which virtually eliminated any chance she had of taking the seat.
The announcement of details of a motorway cutting through the electorate also may have damaged National's chances.
Even in the last stages of the campaign Ms Lee managed to infuriate a low-income audience in the electorate by telling them she was paid only $2 an hour.
