Composite structure

A composite structure comprising an internally inserted component that is inserted into a metal member having a hollow interior so as to enclose the internally inserted component in an enclosed circumferential direction, wherein the internally inserted component:

• is molded from a resin material having a tensile elongation of 10% or more,
• has a molded surface that is attached to an interior surface of the hollow interior of the metal member and that extends in a direction perpendicular to the enclosed circumferential direction,
• has ribs that are latticed and extend perpendicular to the molded surface,
• is disposed inside the hollow interior of the metal member such that an external load, that is applied to the metal member in an external load direction perpendicular to the enclosed circumferential direction, is received by both the internally inserted component and the metal member, and
• has an outer shape that occupies 50% or more as a projection area ratio relative to a cross-section of the hollow interior of the metal member along the enclosed circumferential direction.