Pakistani authorities say they will hand over him to Iran shortly after interrogations.
Abdol Rauf Rigi is the brother of Abdolmalek Rigi, Jundallah's former leader who was arrested by Iran in February and executed in June for 79 counts of crimes, including armed robbery, bombing operations and armed attacks on police and civilians.
The group is responsible for numerous terrorist attacks against Iranian civilians and government officials.
Earlier this month, the group claimed responsibility for a terrorist attack on a religious ceremony in southeastern city of Chabahar in Sistan-Baluchestan Province on December 15.
At least 39 mourners were killed and almost 90 others were wounded in the deadly attack.
Iran says the perpetrators behind the Chabahar attack were trained and equipped by foreign elements beyond the country's eastern borders in Pakistan, urging Islamabad to step up efforts to curb terrorism.
In a phone conversation with his Pakistani counterpart Asif Ali Zardari on Monday, Iranian President Mahmoud Ahmadinejad said the country's security apparatus is ready for exchanging information and mutual cooperation with Pakistan, adding that “cooperation and decisive action by both countries can definitely uproot terrorism in the region.”
Iran has also made several arrests over the terror attack, with one of them on the Iran-Pakistan border.
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