To provide a holder for a hole for increasing a holding force to a mounting hole of a panel while suppressing an amount of projection from the panel even if the panel is a flexible one.

The holder for the hole includes a support section 6 with a support surface 10, an adjustable rotation plate section 11, and a holding piece section 14 on the back surface 5a of a substrate section 5; and a holding piece section 15 adjustably engaged with the holding piece section 14 on the inner surface of the rotation plate section 11. A long hole circumferential edge or the like 2a or 1a is inserted between the support surface 10 and the substrate section back surface 5a, the rotation plate section 11 is adjusted, and the holding piece section 14 is engaged with the holding piece section 15. Thus, the support surface 10 of the support section 6 and the substrate section back surface 5a, or the tip side inner surface of the rotation plate section 11 and the substrate section back surface 5a hold a relatively long portion on both sides in an extending direction of a long hole 2, thereby increasing a holding force. Even when the holding force is increased (particularly, the length in the extending direction of the rotation plate section 11 is extended), the plate thickness of the rotation plate section 11 is not affected and hence the amount of projection from a deck board (panel) 1 is suppressed to the utmost.