An anchoring device in a helicopter deck, where a housing that is provided with an open top and lowered into the helicopter deck, contains a fastener which is vertically displaceable between a withdrawn, inactive position and an active position where an upper fastener portion extends at least partly up from the helicopter deck. The upper fastener portion is arranged to be detachably connected to an anchoring means. The housing is provided with a detachable lid arranged to be able to close tightly against the housing.