Frame which is made of fiber reinforced composite

A frame which is made of a fiber reinforced composite, has an enclosed cross-section defining a plurality of corners, and has a predetermined length, the frame comprising:

• a compressive wall part where a compressive stress occurs in a longitudinal direction of the frame when the frame receives a bending load in a normal direction perpendicularly intersecting the longitudinal direction;
• a side wall part extending in the normal direction and defining one of the corners with the compressive wall part;
• and
• a tension wall part which is away from the compressive wall part and extends in the longitudinal direction, and where a tensile stress occurs in the longitudinal direction when the frame receives the bending load, wherein
• each of the compressive wall part and the tension wall part includes a longitudinal alignment layer having reinforcement fibers aligned in the longitudinal direction,
• the side wall part has a surface section composed of a differential alignment layer having reinforcement fibers aligned in a direction different from the longitudinal direction,
• a connection section where layers constituting the compressive wall part are connected to layers constituting the side wall part lies in the compressive wall part, and/or a connection section where layers constituting the tension wall part are connected to layers constituting the side wall part lies in the tension wall part, and
• the connection section is away from the corresponding corners of the frame.