IRNA's report quotes judicial spokesman Gholam Hossein Mohseni Ejehi as saying that Hamid Baghaei, who was Ahmadinejad's vice president in charge of executive affairs, was arrested today. There were no further details.
Ahmadinejad's administration ended in 2013.
In January, Iran's supreme court convicted and sentenced former Vice President Mohammad Reza Rahimi to five years in prison and fined him 10 billion rials (USD 300,000).
The verdict came after repeated allegations by foes of Ahmadinejad's hard-line government of massive corruption. Since taking over, President Hassan Rouhani has criticized growing corruption in the country in unusually blunt terms.