Maurizio Lupi, who had been resisting calls to quit since the scandal first broke earlier this week, confirmed to Italian television that he would step down tomorrow after answering questions about the case in parliament.
Lupi maintained that he had done nothing wrong, saying he was stepping down purely to avoid further damage to the government's credibility.
"I believe my gesture will strengthen the action of the government," he said in a pre-recorded interview with Porta a Porta, the flagship news and discussion programme of public broadcaster Rai.
Lupi, 55, denied that he had been pressed to quit by Prime Minister Matteo Renzi, as has been widely reported.
The minister, and by extension Renzi, had been embarrassed by the steady dripfeed of damaging reports following the announcement on Monday of an investigation into the suspected rigging of tenders for major public works projects worth a total of 25 billion euros (USD 26 billion).
Among four men arrested in a probe in which a total of 51 officials and businessmen were placed under investigation, was Ettore Incalza, a senior official in Lupi's department until the end of last year.
Examining magistrates suspect that the same businessman, Stefano Perotti, organised a job for the recently-graduated son at an engineering firm run by his brother-in-law, at the request of the minister.
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