To provide a coupling method of a train model coupling-cover (through-path coupling-cover) by a through bar which responds quickly with the movement of the coupling-cover and can be prepared even if it is extremely small.

This coupling cover (through-path coupling-cover) has a through bar 1. A hole 3 allowing the through bar to go in is bored on a base plate 4. Then, the plate 4 is attached on a train. The coupling cover having the through bar 1 (through-path coupling-cover) is adhered roughly simultaneously with coupling.