LONG STRUCTURAL MEMBER AND STRUCTURAL MEMBER COMPLEX USING SAME

Provided are a long structural member and a structural member complex that comprise a fiber-reinforced resin having a simple reinforced structure, suppressing increase in molded article weight, and exhibiting high mechanical properties. The long structural member has a perpendicular cross-section formed in a U shape, has two of the corners on the inside of the U-shaped section reinforced by the fiber-reinforced resin, and has a triangular cross-section for each of the cross-sections of the two corners inside the reinforced U-shaped section, that fulfills the following formulas. 0.05 ≤ W/W0 ≤ 0.15 and 0.15 ≤ H/H0 ≤ 0.36 (W0: length of the outer surface of a floor section of the U-shaped section in a cross-section perpendicular to the axis of the long structural member; W: length of an inner surface of a floor section of the U-shaped section, for the corners on the inside of the reinforced U-shaped section of the cross-section perpendicular to the axis of the long structural member; H0: length of the outer surface of an upright surface section of the U-shaped section of the cross-section perpendicular to the axis of the long structural member; and H: the length of an inner surface of the upright surface section of the U-shaped section, for the corners on the inside of the reinforced U-shaped section of the cross-section perpendicular to the axis of the long structural member.