The AIIB has approved the applications of Afghanistan, Armenia, Fiji, China's Hong Kong and Timor Leste from the region and eight non-regional prospective members including Belgium, Canada, Ethiopia, Hungary, Ireland, Peru, Sudan and Venezuela.
"The interest in joining AIIB from around the world affirms the rapid progress we have made to establish the bank as an international institution," Jin Liqun, president of AIIB told the media here.
The AIIB has several major European countries among its shareholders that joined despite Washington's objections.
TheAIIBwas officially established late last year with 57 founding members.
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With authorised capital of USD 100 billion, China is the largest shareholder with 26.06 per cent voting shares. India is the second largest shareholder with 7.5 per cent followed by Russia 5.93 per cent and Germany with 4.5 per cent.
The 13 prospective members will officially join AIIB once they complete the required domestic processes and deposit the first instalment of capital with the bank.
With 57 founding members, the AIIB which was established in 2015 aims to provide financing to address the daunting infrastructure needs across Asia.
The 13 new additions will take the total number of members of AIIB to 70.