JOINT STRUCTURE

PROBLEM TO BE SOLVED: To connect members such as segments together very easily without requiring complicated work. SOLUTION: This joint metal fitting 1 is constituted of a male joint metal fitting 2 having a connecting rod 11 including a constriction section 15 smaller in diameter than a spherical body 14 on the rear end side of the spherical body 14 at the tip and a female joint metal fitting 3 having a female joint body 21 locking the inserted connecting rod 11. A locking member 25 is provided around the inserting position of the connecting rod 11 in a housing 23. The locking member 25 is constituted of abut sections 25a abutting on the inner periphery of the holding space 26 of the housing 23 by bending both end sections of a wire made of a spring steel and lock sections 25b locked on the constriction section 15 of the connecting rod 11 between the abut sections 25a. When the connecting rod 11 is inserted into the female joint body 21, the lock sections 25b of the locking member 25 are locked on the constriction section 15 of the connecting rod 11, and the male joint metal fitting 2 is locked on the female joint metal fitting 3 to connect segments S together.