A tool box includes a box body having a top cover and a bottom cover which are pivoting on each other, two foldable sets which are both assembled to the top cover and the bottom cover, at least one positioning base is assembled between the two foldable sets. Under this arrangement, the positioning base can be rotated outward relative to the bottom cover by the operation of the two foldable sets. Therefore, the user can pull out the tool bit from the positioning base directly without bending up the tool bit by the finger thereof at first.