Handcuffs for preventing double-locking

To handcuffs for preventing double-locking is added a structure or a member in which a stopper is in resilient contact with and is locked to bodies of the stationary hoops, so that the movement of the stopper is basically prevented even if shocks are transmitted from sides of the bodies of the stationary hoops while the handcuffs are carried, and thus the ability to move a detent thereof is secured. Thereby, a swivel hoop can be rapidly rotated under emergency circumstances while the handcuffs are carried, and can be meshed with the ratchet of a detent installed between the bodies of the stationary hoops. To this end, each of the handcuffs includes a pair of semi-circular stationary hoops on one side thereof, a semi-circular swivel hoop on the other side thereof, a detent and a stopper, which are interposed between the bodies of the stationary hoops, a spring, which resiliently holds the detent and the stopper against each other, a double-locking preventing unit, which causes the stopper to be locked on and be in resilient contact with the bodies of the stationary hoops, and a unit that moves the stopper in one direction by forcibly releasing the double-locking preventing unit.