He quits 15 months into the job, although experts said President was likely to re-appoint him as caretaker premier.
It was Tunisia's first ever free election after a January 14 revolution ousted President Zine al-Abidine Ben Ali.
Sunday's vote was the first since the uprisings which began in Tunisia and spread through the region.
Kargil Vijay Diwas: 10 Bollywood Movies Based On The Lives Of Indian Soldiers
In Photos: The Gionee M6 and M6 Plus Smartphones
Get a Glimpse of Olympic Village at Rio
In Pictures: The LG X Screen Smartphone With Dual Display
West Indies vs India, 1st Test, Day 2
CNN name, logo and all associated elements ® and © 2016 Cable News Network LP, LLLP. A Time Warner Company. All rights reserved. CNN and the CNN logo are registered marks of Cable News Network, LP LLLP displayed with permission. Use of the CNN name and/or logo on or as part of NEWS18.com does not derogate from the intellectual property rights of Cable News Network in respect of them.
© Copyright Network18 Media and Investments Ltd 2016. All rights reserved.