To provide an installing structure capable of easily executing and removing a wall material on and from a wall backing without directly driving a fixture such as a nail in the wall material.

This wall material B installing structure is composed of the long size wall material B having a female tongue part 16 on the upper end, and a male tongue part 17 forming an inward projecting locking groove 18 on the lower end, and a mounting fixture A for forming an inclined pressing piece 13 for fixing the male tongue part 17 of the wall material B on the inside of an inclined engaging piece 11 for fixing the female tongue part 16 of the wall material B, and fixed the wall material B by fixing the mounting fixture A to the wall backing α by the fixing toll β by horizontally connecting a plurality, inserting the female tongue part 16 of the wall material B into the reverse of the inclined pressing piece 13, and engaging a locking groove 18 of the wall material B with the inclined engaging piece 11 of the mounting fixture A by downwardly suspending the wall material B thereafter.