This mosque which is famous as the Chahar Mehrabeh (four mehrabs) is one of the oldest religious buildings of Zanjan and is lovated in the Zajan Bazaar. The main building of the mosque is built in Chehel Sotoun Style (forty columns style) and belongs to 9th Hijri Century. It was reconstructed in Qajar era by Mirza Aboul Qasem Mojtahed. That’s why it is famous as Mirza Mosque also.