To provide a joining structure which can be manufactured inexpensively, which provides sure joining, and which is not exposed to the outside.

In this joining structure in which two members to be joined like a cover attaching member 1 and a cover 3 of a chair are joined by fitting a male member into a female member, the male member consists of a plastic boss 4 and a claw member 5, which is fixed at the tip of the boss 4 and which has a head part with a head whose diameter is larger than that of the boss 4, while the female member is a plastic member having a hole 2, which allows the claw member 5 to pass through and which is formed so that the claw member 5 is caught at the position it passed through.