A headrest structure is equipped with a headrest main body; a headrest stay that supports the headrest main body; and a stopper member, a first end portion of the stopper member configuring a fixing portion fixed to the bottom end portion of the headrest stay, a second end portion of the stopper member configuring a stopper portion that is inserted into a support portion and is formed with a claw portion, when the stopper portion is inserted into the support portion, the claw portion resiliently deforming, when the stopper portion has been completely inserted into the support portion, the claw portion resiliently rebounding such that the outer diameter of the claw portion exceeds the inner diameter of the support portion, and when the stopper portion moves in a direction of exiting from the support portion, the claw portion catches on an end portion of the support portion.