The backpack frame device includes back frames mutually spaced apart and connected, shoulder frames which include one ends coupled with the back frames and the other ends extending over shoulders of a user toward a rear of the waist of the user, supporting pads which are hinge-coupled with bottom ends of the back frames and include top ends opposite to the bottom ends and which are configured to support parts of the shoulder frames, shoulder mounted pads which are coupled with the shoulder frames and elastically pressurize both shoulders of the user, and a lumbar support which is coupled with the bottom ends of the shoulder frames and supports the rear of the waist of the user.