The deals include funding for an $8bn oil refinery in the city of Gwadar.
It comes as part of a high-profile Asian tour by the kingdom's Crown Prince Mohammed bin Salman.
Pakistan is suffering a financial crisis. It has only $8bn left in foreign reserves and is looking to international backers for support.
Prime Minister Imran Khan has been seeking help from friendly countries in order to cut the size of the bailout package his country is likely to need from the International Monetary Fund, under very strict conditions.
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