Mr Key's speech to National's Northland regional conference at Waitangi was his first on home soil after a torrid fortnight dominated by questions about his pulling a waitress' ponytail.
He avoided directly referring to that incident in his speech but made it clear he did not intend to quit: "I am just as committed today to leading National to victory at the next election as I was when first taking up the role as your leader in November 2006."
Mr Key also gave a behaviour pledge of sorts, referring to the need for hard work, oversight and good judgment.
He said he did not take the high levels of support in the polls for granted. "You have my strong commitment that I will do everything I can to lead a strong Government and a strong National Party as we face the next two and a-half years until the 2017 election."
Last year, Mr Key revealed to biographer John Roughan he had considered stepping down in 2012 after a year dominated by issues such as the teapot tapes and Kim Dotcom's donations to John Banks.
Speaking to the media yesterday, he said events such as the Northland byelection loss and troubles over the ponytail pulling had not had the same effect: "Definitely not."
Mr Key spent much of his speech focusing on bread-and-butter issues.
It was his first visit to Northland since the byelection victory by NZ First leader Winston Peters in late March.
In Opua, he announced an extra $3 million towards the Twin Coast cycle trail from the Bay of Islands to Hokianga.
Mr Peters, the local MP, was snubbed for the cycle trail event, which Mr Key attended with Far North Mayor John Carter and Green Party co-leader Russel Norman.
Mr Peters said Mr Key's promise was hollow because land and access rights were delaying the trail.
"Northlanders are not going to be persuaded by a $3 million statement which they may never spend because of those issues."
- Claire Trevett of the New Zealand Herald
