A portable communication device according to various embodiments includes a housing that forms at least a portion of an external surface of the portable communication device, wherein at least a portion of an area of the housing comprises: an aluminum alloy substrate including 90.0 to 99.8 weight % (wt %) of aluminum (Al) and 0.2 to 1.0 wt % of manganese (Mn); and an anodized layer including aluminum oxide (Al2O3) formed on the aluminum alloy substrate, wherein the anodized layer has a first hole and a second hole formed in the anodization layer, wherein the anodized layer may comprise: a plurality of holes including a first hole and a second hole, formed in the anodized layer; a plurality of first channels extending from at least a portion of a surface of the anodized layer to the first hole in a first direction substantially perpendicular thereto, a second channel extending from the first hole toward the aluminum alloy substrate in a second direction different from the first direction, and a third channel extending from the first hole toward the aluminum alloy substrate in a third direction different from the first direction and the second direction. Other embodiments are possible.