A panel joint structure comprising: a first panel member including a panel body section and a first flange section (15, 16) that extends from the panel body section via a corner section; a second panel member that is arranged to oppose the first flange section (15, 16); a joint section that joins the first flange section (15, 16) and the second panel member in a state where the first flange section (15, 16) and the second panel member contact each other; and an adhesive that is continuously provided along a longitudinal direction of the corner section and adheres the first flange section (15, 16) and the second panel member, wherein the first panel member includes a load transmission section, particularly near the joint section, the load transmission section being provided between the panel body section and the first flange section (15, 16) and being set such that an angle (θ2) defined with the panel body section is larger than an angle (θ1) defined by the panel body section and a portion in a short direction of the first flange section (15, 16), in the short direction of the first flange section (15, 16), a flange distal end side end portion of the load transmission section in the short direction of the first flange section (15, 16) is provided to be located in a region between a corner section side end portion of the joint section and a flange distal end side end portion of the joint section in the short direction of the first flange section (15, 16), the second panel member is provided with a second flange section (35, 36) that extends from a second panel body section via a second corner section, the second flange section (35, 36) is arranged to oppose the first flange section (15, 16), the second panel member includes a second load transmission section, particularly near the joint section, the second load transmission section being provided between the second panel body section and the second flange section (35, 36) and being set such that an angle (θ3) defined with the second panel body section is larger than an angle defined by the second panel body section and a portion in a short direction of the second flange section (35, 36), and a flange distal end side end portion of the second load transmission section in the short direction of the second flange section (35, 36) and the flange distal end side end portion of the load transmission section in the first panel member are provided at substantially the same positions. a first panel member including a panel body section and a first flange section (15, 16) that extends from the panel body section via a corner section; a second panel member that is arranged to oppose the first flange section (15, 16); a joint section that joins the first flange section (15, 16) and the second panel member in a state where the first flange section (15, 16) and the second panel member contact each other; and an adhesive that is continuously provided along a longitudinal direction of the corner section and adheres the first flange section (15, 16) and the second panel member, wherein the first panel member includes a load transmission section, particularly near the joint section, the load transmission section being provided between the panel body section and the first flange section (15, 16) and being set such that an angle (θ2) defined with the panel body section is larger than an angle (θ1) defined by the panel body section and a portion in a short direction of the first flange section (15, 16), in the short direction of the first flange section (15, 16), a flange distal end side end portion of the load transmission section in the short direction of the first flange section (15, 16) is provided to be located in a region between a corner section side end portion of the joint section and a flange distal end side end portion of the joint section in the short direction of the first flange section (15, 16), the second panel member is provided with a second flange section (35, 36) that extends from a second panel body section via a second corner section, the second flange section (35, 36) is arranged to oppose the first flange section (15, 16), the second panel member includes a second load transmission section, particularly near the joint section, the second load transmission section being provided between the second panel body section and the second flange section (35, 36) and being set such that an angle (θ3) defined with the second panel body section is larger than an angle defined by the second panel body section and a portion in a short direction of the second flange section (35, 36), and a flange distal end side end portion of the second load transmission section in the short direction of the second flange section (35, 36) and the flange distal end side end portion of the load transmission section in the first panel member are provided at substantially the same positions.