In this joint structure which has a reinforcement part that is formed by bonding a composite material and a reinforcement material via an adhesive, the composite material comprises a plate part formed by laminating multiple textile sheets and a raised part formed by further laminating a textile sheet on the plate part, the plate part and the raised part both have the respective surfaces covered by a single textile sheet, the reinforcement part comprises the raised part and the reinforcement material that is bonded to the raised part via the adhesive, and a first boundary between the plate part and the raised part and a second boundary between the raised part and the reinforcement material are disposed at positions different from each other in the in-plane direction of the lamination interface of the laminated textile sheets.