A carrier for holding a plurality of chip packages and a carrier assembly are provided, wherein the chip package has a central area without solder balls and a peripheral area with solder balls formed thereon. The carrier includes a tray component and a plurality of supports disposed on the tray component, wherein each support holds the central area of a respective chip package. The carrier assembly is formed by stacking a plurality of the carriers through a plurality of peripheral projections disposed at a periphery of each tray component, wherein each peripheral projection has a pin formed thereon and a hole formed thereunder.