The incident occurred yesterday when the three accused stopped the vehicle of Surjeet Kumar of Keltha village while he was going to attend a marriage ceremony with his mother and sister, they said.
Police said the robbers allegedly looted two gold chains, two earrings, two gold rings, a mobile phone and Rs 5,000 at gunpoint.
An FIR has been lodged in this regard and efforts are underway to apprehend the accused, they said.
Meanwhile, BJP District President Dinesh Vashishtha and former Etah MLA Shishu Pal Singh Yadav condemned the incident said that there was complete failure of law and order in the state.