"A big stone rolled down and hit three pilgrims near gate number-3 of the cave shrine today," a police spokesperson said.
Abhay, from Aligarh, is seriously injured and was admitted to Community Health Centre in Katra.
The other two injured pilgrims are 20-year-old Surjeet Barman from West Bengal and 30-year-old Rajiv Singh from Rajasthan.
All three have been hospitalised.