Abstract: A beam member includes: a wire harness; and a hollow metal tube provided to cover at least a portion of the wire harness, wherein the hollow metal tube is provided with a main body portion that covers at least the portion of the wire harness, at least one first protrusion, at least one second protrusion, and at least one flange portion at which a pair of the first protrusion and the second protrusion are fixed, the at least one flange portion protruding toward an outside of the main body portion along a long side direction of the hollow metal tube, and an opening serving as a pullout opening for the wire harness and located at a certain portion of the main body portion in the long side direction, and ??17 N/mm2 is satisfied.

Abstract: A hollow structure includes: a main portion having an inner circumferential surface; and a flange portion including a first overhanging portion and a second overhanging portion that protrude outward from an outer circumference of the main portion and face each other. A first surface of the first overhanging portion and a second surface of the second overhanging portion are continuous with the inner circumferential surface, and the flange portion has a joint portion at which the first surface and the second surface are joined together. The main portion and the flange portion are formed of a metal material composed mainly of a light metal, and the formula ?<A/W1 is satisfied, where W1 is the width of the flange portion, and A is the width of the joint portion.

Abstract: A magnesium alloy contains, in mass %, from 1% to 12% inclusive of Al and from 0.1% to 5% inclusive of Mn and has a structure in which particles of compounds containing Al and Mn are dispersed. The average diameter of the particles of the compounds is from 0.3 ?m to 1 ?m inclusive, and the area ratio of the particles of the compounds is from 3.5% to 25% inclusive.