A backpack-type power supply comprising: a plurality of cell units each configured of a plurality of secondary battery cells connected in series, each of the plurality of cell units having a positive terminal and a negative terminal; a case configured to accommodate the plurality of cell units therein, the case having a first contact and a second contact; a circuit board (60, 60A, 60B) electrically connected to the first contact and configured to control charging and discharging the plurality of cell units, a distance from the circuit board to one of the plurality of cell units being different from a distance from the circuit board to another one of the plurality of cell units; and a harness attached to the case and adapted to be worn on a user's back, characterized in that: the backpack-type power supply further comprises: first connecting means (571, 581) comprising a plurality of first electrically conductive plates (571A, 571B) connected to the positive terminal of each of the plurality of cell units, and a plurality of first lead wires (581A, 581B) configured to connect each of the plurality of first electrically conductive plates to the circuit board to form a first electrical path therebetween, each first electrical path having a first resistance; and second connecting means (572, 582) comprising a plurality of second electrically conductive plates (572A, 572B) connected to the negative terminal of each of the plurality of cell units, and a plurality of second lead wires (582A, 582B) configured to connect each of the plurality of second electrically conductive plates to the second contact to form a second electrical path therebetween, each second electrical path having a second resistance, the first lead wire and the second lead wire for a nearest one of the plurality of cell units to the circuit board have a first length as a whole, and the first lead wire and the second lead wire for a farthest one of the plurality of cell units to the circuit board have a second length as a whole, and the first length being substantially identical to the second length. a plurality of cell units each configured of a plurality of secondary battery cells connected in series, each of the plurality of cell units having a positive terminal and a negative terminal; a case configured to accommodate the plurality of cell units therein, the case having a first contact and a second contact; a circuit board (60, 60A, 60B) electrically connected to the first contact and configured to control charging and discharging the plurality of cell units, a distance from the circuit board to one of the plurality of cell units being different from a distance from the circuit board to another one of the plurality of cell units; and a harness attached to the case and adapted to be worn on a user's back, the backpack-type power supply further comprises: first connecting means (571, 581) comprising a plurality of first electrically conductive plates (571A, 571B) connected to the positive terminal of each of the plurality of cell units, and a plurality of first lead wires (581A, 581B) configured to connect each of the plurality of first electrically conductive plates to the circuit board to form a first electrical path therebetween, each first electrical path having a first resistance; and second connecting means (572, 582) comprising a plurality of second electrically conductive plates (572A, 572B) connected to the negative terminal of each of the plurality of cell units, and a plurality of second lead wires (582A, 582B) configured to connect each of the plurality of second electrically conductive plates to the second contact to form a second electrical path therebetween, each second electrical path having a second resistance, the first lead wire and the second lead wire for a nearest one of the plurality of cell units to the circuit board have a first length as a whole, and the first lead wire and the second lead wire for a farthest one of the plurality of cell units to the circuit board have a second length as a whole, and the first length being substantially identical to the second length. first connecting means (571, 581) comprising a plurality of first electrically conductive plates (571A, 571B) connected to the positive terminal of each of the plurality of cell units, and a plurality of first lead wires (581A, 581B) configured to connect each of the plurality of first electrically conductive plates to the circuit board to form a first electrical path therebetween, each first electrical path having a first resistance; and second connecting means (572, 582) comprising a plurality of second electrically conductive plates (572A, 572B) connected to the negative terminal of each of the plurality of cell units, and a plurality of second lead wires (582A, 582B) configured to connect each of the plurality of second electrically conductive plates to the second contact to form a second electrical path therebetween, each second electrical path having a second resistance, the first lead wire and the second lead wire for a nearest one of the plurality of cell units to the circuit board have a first length as a whole, and the first lead wire and the second lead wire for a farthest one of the plurality of cell units to the circuit board have a second length as a whole, and the first length being substantially identical to the second length.