To provide a hinge structure for preventing the fall-off of a hinge pin without requiring other members than the hinge pin, a base member and an operation member, even though turning the operation member relative to the base member via the hinge pin.

In the hinge structure, a shaft body 11 of the hinge pin 10 consisting of the shaft body 11 and a head body 12 having an outer diameter larger than the outer diameter of the shaft body 11 is inserted into a hinge hole 21 of the base member 20 and a hinge hole 31 of the operation member 30, and the operation member 30 is turned relative to the base member 20. Near the hinge hole 21 on the side of starting the insertion of the hinge pin 10 into the base member 20, a fall-off preventing body 22 is provided for locking the head body 12 of the hinge pin 10 to prevent the fall-off of the hinge pin 10 in the state of being inserted into both hinge holes 21, 31.