The present invention relates to a container-holding tray 1 for holding a plurality of bottomed cylindrical medical containers 50 side by side. The container-holding tray 1 includes the bottom surface part 2 and the container holding convex parts 4 formed on the bottom surface part 2 and configured to hold the medical containers 50, wherein each of the container holding convex parts 4 has a tapered shape that is thin on the upper end side thereof, the plurality of the container holding convex parts 4 are configured to a lattice arrangement on the bottom surface part 2, and simultaneously four of the container holding convex parts 4 are integrated, thereby a container housing part 6 corresponding to one of the medical containers is formed, and the medical containers 50 are configured to be brought into contact with any point from the upper end to the lower end of the four convex parts 4 so as to be held.
