The largest and most influential part of today's society is the new middle class, whose roots go back to the modernization of the Reza Khan period. After the victory of the Islamic revolution, this class expanded mainly in quantity and quality, and since the 1990s, its developments have had more influence. In recent years, and more specifically since 2019, we have witnessed the creation of a more significant gap between the new middle class and the IR. political system, a gap that, more than anything, requires authorities to respond to the growing demands of this class. This research seeks to study the developments of the new middle class, answering the following question, "What changes did the new middle class in the Islamic Republic of Iran undergo until the unrest of 1401(2022), and what are its consequences?" The data shows that the new middle class in Iran has a broad capacity for social, political, and cultural aspects that can be used. Still, the lack of proper response to their demands has recently become a security threat to the country's political system.Keywords: new middle class, social classes, political development, modernization, political and social challenges