A shovel comprising: a lower-part traveling body; and an upper-part swiveling body that is mounted on the lower-part traveling body through a swivel mechanism and includes a boom, an arm, a bucket, a boom cylinder for hydraulically driving the boom, an arm cylinder for hydraulically driving the arm, a bucket cylinder for hydraulically driving the bucket, main pump, a control valve, an engine, a motor generator, a swivel motor, an inverter for the motor generator, an inverter for the swivel motor, and a controller, wherein the boom cylinder, the arm cylinder, and the bucket cylinder are connected to the main pump through the control valve, wherein the control valve functions as a hydraulic control device that controls a hydraulic system, wherein the main pump is driven by the engine, wherein the motor generator assists the engine and generates electricity, wherein the controller performs a drive control of the shovel based on an input using an operation lever (26, 26A, 26B), the shovel further comprising: an electrical power storage device (19, 120) for charging electricity generated by a generator; and an electrical power storage administration part (140, 140A); characterized in that the electrical power storage device (19, 120) is made of a plurality of electrical power storage cells (19-n); and the electrical power storage administration part (140, 140A) includes equalizing circuits (141-n) each of which is connected to corresponding one of the plurality of electrical power storage cells (19-n), an equalizing circuit defect determination part which determines whether a defect exists in the equalizing circuit (141-n), and a shutoff part (146-n, 147-n) which shuts off a connection between the equalizing circuit (141-n) in which the defect is determined to exist and the electrical power storage cell (19-n) connected to the equalizing circuit (141-n). a lower-part traveling body; and an upper-part swiveling body that is mounted on the lower-part traveling body through a swivel mechanism and includes a boom, an arm, a bucket, a boom cylinder for hydraulically driving the boom, an arm cylinder for hydraulically driving the arm, a bucket cylinder for hydraulically driving the bucket, main pump, a control valve, an engine, a motor generator, a swivel motor, an inverter for the motor generator, an inverter for the swivel motor, and a controller, wherein the boom cylinder, the arm cylinder, and the bucket cylinder are connected to the main pump through the control valve, wherein the control valve functions as a hydraulic control device that controls a hydraulic system, wherein the main pump is driven by the engine, wherein the motor generator assists the engine and generates electricity, wherein the controller performs a drive control of the shovel based on an input using an operation lever (26, 26A, 26B), the shovel further comprising: an electrical power storage device (19, 120) for charging electricity generated by a generator; and an electrical power storage administration part (140, 140A); characterized in that the electrical power storage device (19, 120) is made of a plurality of electrical power storage cells (19-n); and the electrical power storage administration part (140, 140A) includes equalizing circuits (141-n) each of which is connected to corresponding one of the plurality of electrical power storage cells (19-n), an equalizing circuit defect determination part which determines whether a defect exists in the equalizing circuit (141-n), and a shutoff part (146-n, 147-n) which shuts off a connection between the equalizing circuit (141-n) in which the defect is determined to exist and the electrical power storage cell (19-n) connected to the equalizing circuit (141-n). an electrical power storage device (19, 120) for charging electricity generated by a generator; and an electrical power storage administration part (140, 140A); characterized in that the electrical power storage device (19, 120) is made of a plurality of electrical power storage cells (19-n); and the electrical power storage administration part (140, 140A) includes equalizing circuits (141-n) each of which is connected to corresponding one of the plurality of electrical power storage cells (19-n), an equalizing circuit defect determination part which determines whether a defect exists in the equalizing circuit (141-n), and a shutoff part (146-n, 147-n) which shuts off a connection between the equalizing circuit (141-n) in which the defect is determined to exist and the electrical power storage cell (19-n) connected to the equalizing circuit (141-n). equalizing circuits (141-n) each of which is connected to corresponding one of the plurality of electrical power storage cells (19-n), an equalizing circuit defect determination part which determines whether a defect exists in the equalizing circuit (141-n), and a shutoff part (146-n, 147-n) which shuts off a connection between the equalizing circuit (141-n) in which the defect is determined to exist and the electrical power storage cell (19-n) connected to the equalizing circuit (141-n).