The signing took place during a visit by Niger's Prime Minister Ali Mahamane Lamine Zeine to Tehran, where he was received by Iranian First Vice President Mohammad Mokhber, the IRNA news agency reported.
Mokhber was quoted as saying during a joint press conference with Zeine that the two countries had "formed and held two meetings of a joint cooperation commission," with the next session expected soon.
The Iranian official added that "fruitful discussions were held on developing trade and economic relations, and the parties prepared and signed beneficial cooperation documents."
Iran and Niger have also prepared agreements on cooperation in technical and engineering services, construction of housing and automobile exports, among other spheres, Mokhber said.