In a side vehicle body structure of a vehicle, which is provided with a shoulder anchor part 2 for a seat belt, a shoulder reinforcement 9 of the shoulder anchor part 2 extends to the joint portion of a side body outer panel 7 and a quarter panel 8, and the shoulder reinforcement 9, the side body outer panel 7, and the quarter panel 8 are jointed together in the state in which the three elements are lapped together.