Exterior material, container, and combination of container and exterior material

An exterior material, wherein:

• the exterior material is for being used by being attached to an outer periphery surface of a container main body included in a container;
• the exterior material is formed from a blank material including a paper-based material;
• the exterior material includes a plurality of projection portions each including a base end portion and a tip end portion, the projection portions protruding from a facing surface facing the outer periphery surface;
• at least some of the projection portions include a low-density portion in which a density of fibers constituting the paper-based material is smaller than that in the base end portion, and a concealing portion is formed at a position closer to the tip end portion than the low-density portion, the concealing portion extending in a direction that intersects a thickness direction of the blank material and concealing at least a part of the outer periphery surface;
• and
• the low-density portion includes a part in which the density of the fibers constituting the paper-based material becomes smaller from the tip end portion to the base end portion.