Patent attributes
A packing box including a box body and a cover body is provided. The box body includes a bottom plate and first side plates connected to the bottom plate. The bottom plate and the first side plates collectively encircle an accommodation space. One of the first side plates includes a first tongue piece extending out of the accommodation space. The first tongue piece includes a fixing end and a free end. The cover body includes a top plate and a second side plate. The top plate is pivotally connected to the box body, such that the top plate is adapted to be opened or closed to expose or shield the accommodation space. The second side plate includes a first inner layer and a first outer layer stacked with each other. The first inner layer has a notch, and the notch is close to one side of the top plate and corresponds to the first tongue piece. When the cover body is closed to the box body, the free end strikes the first outer layer of the second side plate to produce a sound.
