Panel set

A panel set comprising:

• an outer panel component that spreads in a first direction and in a second direction perpendicular to the first direction and includes an outer panel body that is curved convexly outward in section perpendicular to the first direction;
• an inner panel component that is positioned in an inner side of the outer panel component and united with the outer panel component, the inner panel component including an inner panel body that faces the outer panel body, a space being formed between the outer panel body and the inner panel body;
• and
• a stiffening member that is positioned in the space between the outer panel body and the inner panel body,
• wherein:
• when viewed in the first direction, the stiffening member includes an outer-side lateral part positioned near the side of the outer panel body, a first vertical part, a second vertical part, a first inner-side lateral part, a second inner-side lateral part, a first outer-side corner part connecting the outer-side lateral part and the first vertical part, a second outer-side corner part connecting the outer-side lateral part and the second vertical part, a first inner-side corner part connecting the first vertical part and the first inner-side lateral part, and a second inner-side corner part connecting the second vertical part and the second inner-side lateral part;
• the stiffening member has a width in the first direction;
• the first outer-side corner part is joined to a first portion of the outer panel body that is away from an apex part of the outer panel body;
• the second outer-side corner part is joined to a second portion of the outer panel body that is opposite the first portion with the apex part in between;
• and
• the first inner-side lateral part and the second inner-side lateral part are joined to the inner panel body.