Structural member and method of manufacturing structural member

A structural member comprising:

• a wall including a first side wall and a second side wall facing each other;
• a space surrounded by the wall;
• and
• a plurality of ribs provided in the space and coupling the first side wall and the second side wall, wherein
• the plurality of ribs include:
• a plurality of columnar first ribs each of which extends linearly in a first direction and which couple the first side wall and the second side wall,
• a plurality of columnar second ribs each of which extends linearly in a second direction and which couple the first side wall and the second side wall,
• a plurality of columnar third ribs each of which extends linearly in a third direction and which couple the first side wall and the second side wall, and
• a plurality of columnar fourth ribs each of which extends linearly in a fourth direction and which couple the first side wall and the second side wall,
• the first direction, the second direction, the third direction, and the fourth direction are directions different from one another,
• a plurality of coupling portions each coupling the first rib, the second rib, the third rib, and the fourth rib are formed,
• each of the first rib, the second rib, the third rib, and the fourth rib is joined between the first side wall and the second side wall without connecting through the coupling portions,
• the first ribs and the second ribs intersect within a plane A, the third ribs and the fourth ribs intersect within a plane B, the plane A and the plane B are parallel to each other, and the plane A and the plane B are coupled by the coupling portions, and
• the first ribs, the second ribs, the third ribs, and the fourth ribs are not coupled to other ribs except at the coupling portions.

A structural member comprising:

• a first side wall and a second side wall facing each other;
• a bottom wall coupling one end of the first side wall and one end of the second side wall;
• an opening formed between an other end of the first side wall and an other end of the second side wall;
• and
• a plurality of ribs and coupling portions disposed between the first side wall and the second side wall, wherein
• a plurality of the coupling portions formed on a farthest side from the bottom wall are formed on one of the first side wall and the second side wall,
• a plurality of the coupling portions formed on a side of the bottom wall one row below the coupling portions formed on the farthest side from the bottom wall are formed on other of the first side wall and the second side wall, and
• the coupling portions are positioned at vertices or a center of a unit lattice.