To provide a hook capable of preventing a supporting member from rattling or slipping off, allowing easy operation of removing and replacing, and serviceable even as a decoration member.

The bottoms 3c and 4c of supporting members 3 and 4 are inserted into a supporting hole 2e formed in the receptacle part 2d of a supporting part 2c to constitute a hook body 2, and to the peripheral surfaces of the bottoms 3c and 4c, a sphere 5b of a slipoff preventive tool 5 is put in pressure contact in such a way as perpendicularly intersecting the inserting direction, and with this pressure contacting force, the supporting members 3 and 4 are inserted to any depth and fixed, and therefore, it is possible to change the protruding dimensions any as desired. Otherwise, the sphere 5b is engaged with one or a plurality of recesses 3e and 4e formed in the supporting members 3 and 4 and fixed in such a way that slipping-off is prevented, the protruding dimensions of the supporting members 3 and 4 can be changed and adjusted in steps.