A radiation image detecting system comprising: a cassette type radiation image detecting apparatus capable of being driven by electric power supplied from a built-in battery which supplies the electric power to each of function sections; a charge controlling circuit to control charging of the battery; a cradle supplying electric power from an outside to the radiation image detecting apparatus by placing the radiation image detecting apparatus thereon; and a cable capable of supplying electric power from the outside to the radiation image detecting apparatus by being connected to the radiation image detecting apparatus, wherein the radiation image detecting apparatus includes a connection section being electrically connectable to either or both of the cradle and the cable to receive the electric power; the battery is charged by the cradle being connected to the connection section and by the cable being connected to the connection section; and characterized in that the radiation image detecting apparatus is capable of performing radiology in a connecting state of the cable; a detection section is provided for detecting which of the cradle or the cable is connected to the connection section; the charge controlling circuit switches a charging current between a time when the cradle is connected to the connection section and a time when the cable is connected to the connection section according to a detection result of the detection section; and the charge controlling circuit sets the charging current so that the charging current when the cable is connected to the connection section is smaller than the charging current when the cradle is connected to the connection section. a cassette type radiation image detecting apparatus capable of being driven by electric power supplied from a built-in battery which supplies the electric power to each of function sections; a charge controlling circuit to control charging of the battery; a cradle supplying electric power from an outside to the radiation image detecting apparatus by placing the radiation image detecting apparatus thereon; and a cable capable of supplying electric power from the outside to the radiation image detecting apparatus by being connected to the radiation image detecting apparatus, wherein the radiation image detecting apparatus includes a connection section being electrically connectable to either or both of the cradle and the cable to receive the electric power; the battery is charged by the cradle being connected to the connection section and by the cable being connected to the connection section; and characterized in that the radiation image detecting apparatus is capable of performing radiology in a connecting state of the cable; a detection section is provided for detecting which of the cradle or the cable is connected to the connection section; the charge controlling circuit switches a charging current between a time when the cradle is connected to the connection section and a time when the cable is connected to the connection section according to a detection result of the detection section; and the charge controlling circuit sets the charging current so that the charging current when the cable is connected to the connection section is smaller than the charging current when the cradle is connected to the connection section.