Joint structure, automotive component, and joint structure manufacturing method

A joint structure comprising:

• a first sheet member;
• a second sheet member overlapped with the first sheet member in a sheet thickness direction;
• a third sheet member overlapped in the sheet thickness direction on an opposite side of the second sheet member from a side overlapped with the first sheet member;
• and
• a plurality of joining parts formed at locations where the first sheet member, the second sheet member, and the third sheet member overlap, so as to join the first sheet member, the second sheet member, and the third sheet member together,
• the plurality of joining parts being formed at an interval along an edge of the first sheet member and an edge of the second sheet member, and
• the third sheet member including a fold-back portion provided at least between the plurality of joining parts by folding the third sheet member back around the edge of the first sheet member and the edge of the second sheet member such that the fold-back portion is disposed on an opposite side of the first sheet member from a side overlapped with the second sheet member,
• the plurality of joining parts overlap with the fold-back portion as viewed along the sheet thickness direction, and
• all of the joining parts, which overlap with the fold-back portion in a single fold-back portion, joining the first sheet member, the second sheet member, and the third sheet member together, without the first sheet member and the fold-back portion of the third sheet member being welded together.