A toolbox apparatus includes a case, a cover and a flexible strip for pivotally connecting the case to the cover. The case includes a space defined therein for containing tools, an inclined face formed thereon, at least one engagement unit formed on the inclined face and at least one block formed thereon. The cover includes an inclined face for contact with the inclined face of the case in a displaying position of the toolbox apparatus, at least one engagement unit formed on the inclined face thereof for engagement with the engagement unit of the case for retaining the toolbox apparatus in the displaying position and at least one buckle formed thereon for engagement with the block of the case in a closed position.