Provided are a paper feeding device and an image forming apparatus having the same. The paper feeding device comprises a paper feeding cassette with a knock-up plate on which paper is stacked and an elastic member for elastically biasing the knock-up plate in an upward direction; a pickup roller for pressing and feeding paper stacked on the knock-up plate; and a double feeding prevention member comprising a friction pad disposed below the pickup roller to prevent doubling feeding of paper fed by the pickup roller and a friction prevention portion disposed at a side on which a front end of the sheet of paper enters and reducing friction with entering paper.