Vehicle side structure

A vehicle side structure comprising:

• a pillar upper portion constituting, in a side portion of a vehicle, an upper part in a vehicle up-down direction in a pillar outer panel as an outer plate of a center pillar extending along the vehicle up-down direction, the pillar upper portion being joined to a roof side rail extending along a vehicle front-rear direction;
• a pillar lower portion constituting a lower part, in the vehicle up-down direction, of the pillar outer panel, the pillar lower portion being joined to a rocker extending along the vehicle front-rear direction, the pillar lower portion having a tensile strength lower than the pillar upper portion;
• a joining portion where a first part including an upper end of the pillar lower portion is joined to a second part including a bottom end of the pillar upper portion in a state where the first part overlaps with an inner side of the second part in a vehicle width direction;
• and
• a constituent part provided in the first part of the pillar lower portion, at a position above the bottom end in the vehicle up-down direction, the constituent part including one of a projection projecting inwardly in the vehicle width direction or a hole.