To provide a floor panel fixture capable of preventing a floor panel from coming off from a receiving tool even when extremely vigorously vibrated by an earthquake or the like and preventing the vibration of the floor panel, and never generating powder dust.

This floor panel fixture for attachably and detachably mounting the floor panel P on the receiving tool 2 of a support leg 1 comprises a sleeve 3 having a head part to be engaged with the floor panel, a lock pin 4 having a head part 4a in the upper part exposed out of the sleeve and a thread part 4b in the lower part exposed out of the sleeve, and a compression coil spring 5 interposed between the head part of the lock pin and the stepped part of the sleeve. The lock pin is rotated in a screwing direction while it is pressed down in the mounted state of the floor panel fixture, the thread part is screwed to the thread groove of the receiving part 7 of the receiving tool to engage the head part of the lock pin with a recessed part around the hole 12 of the floor panel.