Transport Secretary Patrick McLoughlin visited Halifax to lend his support to Conservative candidate Philip Allott.
Mr McLoughlin was given a bus tour of the town and dismissed introducing means testing for bus passes.
Labour and the Liberal Democrats have said they would remove some benefits from better-off pensioners.
But Mr McLoughlin said he was opposed to the idea.
“I don’t think it creates that much money. I think the amount of money that you spend by means testing it would not serve us well,” he said.
“We’ve got to give pensioners a fair deal. Gordon Brown increased the pension one year by 75p.
“We’ve ruled out doing that and we have a triple lock on pensions - it’s either a 2.5 per cent increase or the cost of wages or price rises - whichever is the higher of those three we will give pensioners.
“I don’t think we should start taking benefits away from, they’ve paid into the system over many years.”