Vehicle frame body manufacturing method and vehicle frame structure

A vehicle frame structure comprising:

• a frame member being a single member and having an elongated shape and a chamber structure, the frame member being formed with a bend section and having a bent axis;
• and
• a reinforcing member placed at a portion of the frame member, the portion being in a length direction of the frame member and within the frame member;
• the frame member including:
• a first wall that extends along the length direction of the frame member and that forms a bent face outer circumference of the bend section, and
• a second wall that extends along the length direction of the frame member and that forms a bent face inner circumference of the bend section;
• and the reinforcing member including:
• a first reinforcing portion that is placed along an inside face of the first wall and that includes a first pressure joined portion pressure joined to the inside face of the first wall at a location forming the bend section,
• a second reinforcing portion that is placed along an inside face of the second wall and that includes a second pressure joined portion pressure joined to the inside face of the second wall at a location forming the bend section, and
• a linking portion that links the first reinforcing portion and the second reinforcing portion together, wherein:
• the first wall and the second wall are disposed at a top and a bottom of the frame member;
• the frame member further includes:
• an outer wall that links a vehicle outer end of the first wall and a vehicle outer end of the second wall together in a vehicle vertical direction,
• an inner wall that links a vehicle inner end of the first wall and a vehicle inner end of the second wall together in the vehicle vertical direction,
• a first step portion that is formed at an inner wall side of the first wall and that faces a vehicle outer side, and
• a second step portion that is formed at an inner wall side of the second wall and that faces the vehicle outer side;
• and
• a vehicle inner end of the first reinforcing portion is abutted by the first step portion, a vehicle inner end of the second reinforcing portion is abutted by the second step portion, and the linking portion links a vehicle outer end of the first reinforcing portion and a vehicle outer end of the second reinforcing portion together in the vehicle vertical direction and is placed along an inside face of the outer wall of the frame member.