A docking device according to an embodiment, on which an electronic apparatus is mounted in a demountable manner, includes a hook member, a hook interlocking member interlocking with the hook member and a latching member. By the operation to a demount-operating part, the hook member slidingly moves from a locking position where the hook member engages with an engaging hole of the electronic apparatus, to an unlocking position where the hook member does not engage with the engaging hole. When the electronic apparatus is not mounted on the docking device, the latching member is pressed up to a first level where it does not latch the hook interlocking member, and protrudes from a mounting surface on which the electronic apparatus is mounted. When the electronic apparatus is mounted, the latching member is pressed down to a second level where it can latch the hook interlocking member.