A cradle device configured to removably support a portable information terminal including a receptacle connector formed in a lower end thereof, and to allow fitting between the receptacle connector of the supported portable information terminal and a plug connector to be fitted into the receptacle connector, the cradle device comprising: a body comprising a main mounting surface inclined backward on an upper side thereof to support a back surface of the portable information terminal; and a battery-charging cover, housing the plug connector so that a tip of the plug connector protrudes from an upper end of the battery-charging cover, and configured to be rotatable forward about pivots arranged at a lower end of the main mounting surface, the upper end of the battery-charging cover being perpendicular to the main mounting surface of the body when the battery-charging cover is not rotated forward, and the upper end of the battery-charging cover being configured to support the lower end of the portable information terminal to be held on the main mounting surface, the plug connector being configured to be fitted into the receptacle connector in a fitting direction when the lower end of the portable information terminal is supported by the upper end of the battery-charging cover, the body further comprising ribs fixed at the lower end of the main mounting surface, the battery-charging cover comprising notches formed in the upper end thereof so as to allow the ribs to protrude, the ribs being configured to relatively project from the upper end of the battery-charging cover through the notches gradually along with the forward rotation of the battery-charging cover so that the portable information terminal is gradually raised from the upper end of the battery-charging cover, such that the plug connector is automatically extracted from the receptacle connector in the fitting direction, wherein a round surface or a chamfered portion is formed on an upper forward corner portion of each of the ribs,wherein the notches comprise a pair of notches arranged at the upper end of the battery-charging cover at positions corresponding to both sides of the plug connector, and wherein the ribs comprise a pair of rib pieces arranged at the lower end of the main mounting surface at positions corresponding to both sides of the plug connector. a body comprising a main mounting surface inclined backward on an upper side thereof to support a back surface of the portable information terminal; and a battery-charging cover, housing the plug connector so that a tip of the plug connector protrudes from an upper end of the battery-charging cover, and configured to be rotatable forward about pivots arranged at a lower end of the main mounting surface, the upper end of the battery-charging cover being perpendicular to the main mounting surface of the body when the battery-charging cover is not rotated forward, and the upper end of the battery-charging cover being configured to support the lower end of the portable information terminal to be held on the main mounting surface, the plug connector being configured to be fitted into the receptacle connector in a fitting direction when the lower end of the portable information terminal is supported by the upper end of the battery-charging cover, the body further comprising ribs fixed at the lower end of the main mounting surface, the battery-charging cover comprising notches formed in the upper end thereof so as to allow the ribs to protrude, the ribs being configured to relatively project from the upper end of the battery-charging cover through the notches gradually along with the forward rotation of the battery-charging cover so that the portable information terminal is gradually raised from the upper end of the battery-charging cover, such that the plug connector is automatically extracted from the receptacle connector in the fitting direction,