A management device configured to manage a power storage module including n pieces of series-connected power storage blocks (B1 to Bn), n being an integer of 2 or greater, each having m pieces of parallel-connected power storage cells (S11 to Snm), m being an integer of 1 or greater, wherein the management device is configured to identify one of the power storage blocks (B1 to Bn) containing at least one of the power storage cells in an abnormal state based on a voltage drop rate of each of the n pieces of the power storage blocks (B1 to Bn), the management device comprising: a voltage detector configured to detect a voltage across each of the n pieces of the power storage blocks (B1 to Bn); a storage unit configured to store the detected voltage of each of the power storage blocks (B1 to Bn) on a time-series basis; a voltage drop rate calculator configured to calculate time-series data of the voltage drop rate of each of the power storage blocks based on time-series data of the voltages of the power storage blocks (B1 to Bn); and characterized in that the management device further comprises: an abnormality determiner configured to determine that the one of the power storage blocks contains the at least one of the power storage cells in the abnormal state on condition that a difference between the voltage drop rate of the one of the power storage blocks (B1 to Bn) and an average value or a median value of the voltage drop rates of the remaining power storage blocks among the n pieces of the power storage blocks (B1 to Bn) is greater than or equal to a first predetermined value, and an amount of change in the voltage drop rate of the one of the power storage blocks is greater than or equal to a second predetermined value. wherein the management device is configured to identify one of the power storage blocks (B1 to Bn) containing at least one of the power storage cells in an abnormal state based on a voltage drop rate of each of the n pieces of the power storage blocks (B1 to Bn), the management device comprising: a voltage detector configured to detect a voltage across each of the n pieces of the power storage blocks (B1 to Bn); a storage unit configured to store the detected voltage of each of the power storage blocks (B1 to Bn) on a time-series basis; a voltage drop rate calculator configured to calculate time-series data of the voltage drop rate of each of the power storage blocks based on time-series data of the voltages of the power storage blocks (B1 to Bn); and characterized in that the management device further comprises: an abnormality determiner configured to determine that the one of the power storage blocks contains the at least one of the power storage cells in the abnormal state on condition that a difference between the voltage drop rate of the one of the power storage blocks (B1 to Bn) and an average value or a median value of the voltage drop rates of the remaining power storage blocks among the n pieces of the power storage blocks (B1 to Bn) is greater than or equal to a first predetermined value, and an amount of change in the voltage drop rate of the one of the power storage blocks is greater than or equal to a second predetermined value. an abnormality determiner configured to determine that the one of the power storage blocks contains the at least one of the power storage cells in the abnormal state on condition that a difference between the voltage drop rate of the one of the power storage blocks (B1 to Bn) and an average value or a median value of the voltage drop rates of the remaining power storage blocks among the n pieces of the power storage blocks (B1 to Bn) is greater than or equal to a first predetermined value, and an amount of change in the voltage drop rate of the one of the power storage blocks is greater than or equal to a second predetermined value. <EOS>