To provide a residual-quantity-of-accumulated-electricity checking device for secondary cells formed so as to measure a residual quantity of accumulated electricity of a secondary cell, using physical property values inherent in the secondary cell considering its characteristic.

The checking device 10 for a residual quantity of accumulated electricity of a secondary cell is provided with a voltage-to-be-applied supplying section 6 for supplying a voltage to be applied to the secondary cell 1, a current detecting section 3 for detecting the value of a current to be caused to flow in the secondary cell 1 when a checking voltage is applied to the secondary cell 1, a conversion means for deriving information on the residual quantity of the accumulated electricity of the secondary cell 1 from the detected current value, and a display section 7 for displaying the information on the residual quantity of the accumulated electricity.