现年47岁莱塔在一份电子邮件声明中表示，“我已经告诉总统纳波利塔诺(Napolitano)，我将会在明天递交辞呈的意图。”
此项声明结束了长达数周的民主党(PD)内部摩擦，这也令意大利10个月的新政府面临暂停的风险。莱塔在其政党投票中没能获得支持，他不得不屈服并辞职。
Italian Prime Minister Enrico Letta has said he will resign on Friday after his Democratic Party backeda call for a new administration.
Party leader Matteo Renzi had earlier called for a change of government at a party meeting, sayingthe country could not go on in "uncertainty".
Speculation has been rife that Mr Renzi wants to take over as prime minister.
He is eight years younger than Mr Letta and was elected leader of the party in December.
Mr Letta said in a statement that his decision followed "the decision taken today by the nationalleadership of the Democratic Party".
He said he would formally submit his resignation to President Giorgio Napolitano at thepresidential palace on Friday.
Relations between Mr Letta and Mr Renzi had become increasingly fraught, the BBC's AlanJohnston reports from Rome.
The Democratic Party now hopes that Mr Renzi will be able to replace him, and form a newadministration, our correspondent adds.
Mr Renzi has previously accused Mr Letta of a lack of action on improving the economy, withunemployment at its highest level in 40 years and the economy shrinking by 9% in seven years.
Correspondents say that although the prime minister has kept a careful lid on public expenditure,he has not been able to carry out much-needed administrative reforms and stimulate economicgrowth.
The latest political turmoil has so far had little impact on financial markets, in contrast with thevolatility seen before the current coalition was formed.
Mr Letta did not attend Thursday's party meeting, which had been brought forward from nextweek.
At the meeting, Mr Renzi thanked Mr Letta for his "remarkable work" but said the country couldnot go on in "uncertainty".
He said his proposal - a new government to take over until the end of the current parliamentaryterm in 2018 - was a way out of the "morass".
Mr Letta, 47, formed a coalition with the centre-right last year but there had been mountingspeculation over his future after Mr Renzi was elected party leader in December.
After Mr Letta announced his intention to resign, Angelino Alfano, leader of a centre-right factionthat has been part of Mr Letta's government, gave a guarded welcome to Mr Renzi's plans.
There was no guarantee that an attempt to form a new government under Mr Renzi would work,Mr Alfano said, saying he would not support a new administration whose policies were too left-wing.
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