A joint structure is for joining a pair of connecting members to each other. One of the connecting members has a lock portion formed so as to protrude from the member, and the other connecting member is provided with a receiving portion into which the lock portion is insertable. The lock portion is inserted into the receiving portion while at least one of the lock and receiving portions is being resiliently flexed. Thereafter, the lock or receiving portion is restored to its initial shape. As a result, the lock and receiving portions are joined to each other. The lock and receiving portions are abutted against each other such that at least one of the lock and receiving portions deforms the other into engagement with one another. As a result, this deformation limits relative movement between the lock and receiving portions.