To provide a battery pack inspection method that can inspect a battery pack as finished products in delivery state without activating a non-return switch, and a battery pack that can be examined by the above method.

The potential of an input terminal 53 of a protection IC 5, which is connected to one of junction points of secondary batteries 11, 12, and 13 series-connected via a resistor 43, is forcibly lowered by switching on output of an output port 731 of an open drain connected to the input terminal 53 via the resistor 44. In this way, In a case where the protection IC 5 detects an overvoltage state of the secondary battery 12 and outputs a detection signal, the output of the output port 731 is switched off when the detection signal is detected via the input port 732, so that the overvoltage state of the secondary battery 12 detected by the protection IC 5 is dissolved. The output of the detection signal is thus stopped in a short time, thereby avoiding fusing of fuses 31 of the non-returning switch 30.