A component carrying tray includes a bottom plate on which a component is stacked, and a projection. The projection has a main body and a regulator. The main body is hollow and has a tapering shape. The regulator is formed in the main body and extends in a direction perpendicular to the carrying surface and contacts a side surface of the component to regulate the component carried on the carrying surface. The bottom plate has a through hole so that when the component carrying tray is stacked on an additional component carrying tray, a projection of the additional component carrying tray comes into the hollow part of the main body. An opening is formed in the projection and configured to avoid, when the component carrying tray is stacked on an additional component carrying tray, interference between the projection and a regulator of the additional component carrying tray.