To provide a head-mounted display can be improved ease and mounting stability of the mounting operation. Mounting band (20) has a relative movement a movable section (30) in the longitudinal direction of the mounting band (20) with respect to the extending portion extending portion (24) (24). Locking mechanism M includes a magnification direction to increase the length of the mounting band (20), and an unlocked state in which movement of the movable portion (30) is permitted to the reduction direction to increase the length of the mounting band (20) , it is possible to switch the mounting band between a locked state in which movement of the movable part of the expansion direction (30) is regulated (20). The movable portion (30) is biased in reduction direction at least in the unlocked state.