A refrigerator includes a rack gear assembly provided on a lower surface of a drawer, wherein the rack gear assembly has a first rack member and a second rack member sequentially moved forward such that an opening distance of the drawer is maximized, and a wing end of the second rack member and a blocking part of a bottom of a storage chamber are provided such that exact engagement of a rack gear with a pinion is maintained during opening of the drawer. In addition, while the drawer is opened, an unwanted movement of the drawer in a closing direction thereof is prevented.