A vehicle body structure comprising: a frame structure portion configured to define an opening , the frame structure portion including a first panel having a first joint portion (26C1), a second panel having a second joint portion , and a first adhesive portion that adheres to the first joint portion (26C1) and the second joint portion ; a windowpane that is provided on a vehicle outside of the opening and that covers the opening ; and a second adhesive portion that adheres to the first panel, the second panel, and the windowpane, wherein at least one of the first panel and the second panel is made of resin, the second adhesive portion is arranged closing off or covering an open end of a gap in a joint between the first panel and the second panel , and the first adhesive portion is arranged within the gap , characterized in that the second adhesive portion adheres to the first panel , the second panel and the windowpane ; the first panel includes an extended portion (26C3) that extends in a direction toward an end portion of the windowpane via a stepped portion (26C2) from the first joint portion (26C1), the extended portion (26C3) is arranged such that the open end is positioned between an end portion of the second joint portion and the stepped portion (26C2), and the second adhesive portion adheres to the end portion of the second joint portion , the extended portion (26C3), and the windowpane , wherein the extended portion (26C3) and the second joint portion are made flush with each other. a frame structure portion configured to define an opening , the frame structure portion including a first panel having a first joint portion (26C1), a second panel having a second joint portion , and a first adhesive portion that adheres to the first joint portion (26C1) and the second joint portion ; a first panel having a first joint portion (26C1), a second panel having a second joint portion , and a first adhesive portion that adheres to the first joint portion (26C1) and the second joint portion ; a windowpane that is provided on a vehicle outside of the opening and that covers the opening ; and a second adhesive portion that adheres to the first panel, the second panel, and the windowpane, wherein at least one of the first panel and the second panel is made of resin, the second adhesive portion is arranged closing off or covering an open end of a gap in a joint between the first panel and the second panel , and the first adhesive portion is arranged within the gap , characterized in that the second adhesive portion adheres to the first panel , the second panel and the windowpane ; the first panel includes an extended portion (26C3) that extends in a direction toward an end portion of the windowpane via a stepped portion (26C2) from the first joint portion (26C1), the extended portion (26C3) is arranged such that the open end is positioned between an end portion of the second joint portion and the stepped portion (26C2), and the second adhesive portion adheres to the end portion of the second joint portion , the extended portion (26C3), and the windowpane , wherein the extended portion (26C3) and the second joint portion are made flush with each other. <EOS>