The blast occurred last night when the wedding function was underway in a hotel, Ajmer district collector Gaurav Goyal said, adding that the explosion severely damaged the building.
Bodies of six people have been recovered while the injured five are undergoing treatment, he said, adding that rescue operation is on to trace the missing people, believed to be13 in number.
Two cars parked outside the building and the adjoining buildings also were damaged in the blast, police said.