PURPOSE: To provide a hook metal which enables the transmitting of touching of a runner part when fitted into an opening of a guide rail clearly.

CONSTITUTION: A roughly square protruded part 5a is formed on the bottom of a runner part 5 and a cylinder body 5b is arranged protruding on the undersurface of the protruded part 5a. A washer 4 and a coil spring 3 are put through the cylinder body 5b of the runner part 5 to screw a spring receiving part 2 down on the cylinder body 5b. The coil spring 3 is housed into a hole 2a of the spring receiving part 2 and forces the washer 4 to be pressed onto the runner part 5. A shaft 1a of a hook part 1 is screwed securely into the cylinder body 5b of the runner part 5.