Bachchan tweeted that he had visited the shrine 40 years ago. He untied a dhaga, thanks to a 'promise fulfilled' and tied a fresh one.
The actor clarified that his fulfilled wish had nothing to do with daughter-in-law Aishwarya Rai Bachchan's pregnancy.
Fans, who got wind of Bachchan's arrival, thronged the venue for a closer look.
After his Ajmer stop, Bachchan headed to Jaipur.