PURPOSE: To mount an accessary part on the wooden partition in a simple process and a simple structure.

CONSTITUTION: A through hole 1a is arranged on a wooden partition 1 and also the wooden base end leg part 2a of an accessary part to be mounted on one surface of the partition 1 is penetrated in this through hole 1a and a come off stopping pin 3 is attached penetratingly in a shaft hole 2d arranged on the penetrated end 2c of this base end leg part 2a while crossing nearly orthogonally with the through hole 1a. In this mounting, an auxiliary metal fitting which provides a metal fitting main body 4a attaching on the base end leg part 2a and an elastic tongue piece 4b, which is arranged on one end of this metal fitting main body 4a, extending outside of the through hole 1a while slanting in the direction leaving gradually from the surface of the partition 1 is arranged in the through hole. The head part 3b of the come off stopping pin 3 is connected onto the other surface of the partition 1 and also the penetrated end part 3c of the come off stopping pin 3 is brought in elastic contact with the elastic tongue piece 4b.