To provide a combination structure for members which facilitates aligning of combination holes drilled in respective members and is difficult to loose a combination made by rivets.

In a joining method for a laminated plate joining the second member 2, in which metal sheets 22 are stuck on both sides of synthetic resin core material 21, and a first member 1 with rivets 4, each of which has a cylindrical rivet body 42. The rivet body 42 is penetrated into the combination hole 13 arranged on the first member 1, and is inserted into the combination hole 23 formed on the rear of the second member 2. An inserted end of the rivet 4 is enlarged in the inside of the core material 21, and the internal diameter of the combination hole 13 is set up to be larger than the outside diameter of the rivet body 42. When the combination hole 23 can be connected with a drilling tool 3 which supports a drill 5 for forming a combination hole, joining strength between the second member 2 and first member 1 is scarcely varied when joining both members with the rivets 4.