Built in the early IXth century, remodelled and extended during the Xth and XVIIth centuries, it is adjacent to the Ribat, from which it has inherited the fortified aspect with a crenellated surrounding wall flanked by two watchtowers facing the shore, from where assailants from overseas could have appeared.

A small door leads into the building and gives into a vast courtyard surrounded by porticos with arcades dating to the XVIIth century. The prayer room, as vast as the courtyard, is surmounted by two cupolas with shells; its roofing is supported by masonry pillars and its mihrab oriented towards Mecca, is richly decorated.