Stung by their loss to France in the tournament opener last week, New Zealand tore into the Africans from the kickoff at a high tempo and scrumhalf Cam Roigard crossed twice in the first seven minutes on his first test start.
Flyhalf Damian McKenzie also grabbed two tries, the bonus point was secured by winger Leicester Fainga'anuku in the 25th minute, and after that, it was only a matter of how many points the All Blacks could score.
Namibia never stopped looking for a try and had their chances, especially after New Zealand prop Ethan De Groot was sent from the pitch for a red card offence, but move on to face France next week still without a World Cup win in 24 attempts.