Adhai Din Ka Jhonpra (literally "shed of 2½ days") is a historical mosque in the city of Ajmer in Rajasthan, India. It is one of the oldest mosques in India, and the oldest surviving monument in Ajmer. The structure was used as a mosque up to 1947. After the independence of India, the structure was turned over to the Jaipur circle of ASI (Archaeological Survey of India) and is today visited by people of all religions, as a fine example of a mix of Indian, Hindu, Muslim and Jain architectures.