PURPOSE: To provide a fitting structure of holding member for articles, etc., which is designed to hold even a heavy article by increasing fastening force.

CONSTITUTION: A holding device 3 which holds a wall panel P and forms a hole 2 comprises a protrusion 32 which rises on a foundation 31 and a tube 33 for a mouth which protrudes in the center of the protrusion 32, and the tube 33 and the protrusion 32 are communicated with each other in their hollow internal parts, form a hole square in cross section integrally, and a recess 4 is formed in the inner wall on the side of the substrate end. An article holding member 8 contains an operation piece 10 which is moved up and down by an adjustment screw 12, the operation piece 10 has a hook 10b which can come into and out from the recess 4 in its head and connect the article holding member 8 strongly.