A secondary-battery electrode group unit comprising: a wound electrode group formed by winding a layered member including a positive electrode, a negative electrode, and a separator, the positive electrode having an applied layer formed by applying a positive active material mixture to a first metal foil and an unapplied portion on which the positive active material mixture is not applied along the applied layer of the positive active material mixture, the negative electrode having an applied layer formed by applying a negative active material mixture to a second metal foil and an unapplied portion on which the negative active material mixture is not applied along the applied layer of the negative active material mixture, and the positive electrode and the negative electrode being layered via the separator such that the unapplied portion of the positive electrode and the unapplied portion of the negative electrode project in directions opposite to each other; a positive current collecting member welded to the unapplied portion of the positive electrode, the unapplied portion of the positive electrode projecting beyond the separator at one end portion of the wound electrode group; and a negative current collecting member welded to the unapplied portion of the negative electrode, the unapplied portion of the negative electrode projecting beyond the separator at the other end portion of the wound electrode group, and at least one of the positive current collecting member and the negative current collecting member comprising a terminal forming portion (15,17) configured to form a terminal and a current collecting portion (16,18) including a plurality of welded portions (33, 34) provided to face the unapplied portion (30, 32) and welded to a part of the unapplied portion (30, 32) by laser welding, a conductive member (35,36) is mechanically and electrically connected to the current collecting portion (16,18) and the terminal forming portion (15,17) to form, besides a current path passing directly through the current collecting portion (16,18) and the terminal forming portion (15,17) and bypassing the conductive member (35,36), another current path allowing a current to flow from a part of the current collecting portion (16,18) to the terminal forming portion (15,17) through the conductive member (35,36) while bypassing another part of the current collecting portion (16,18) characterized in that the conductive member (36, 50) is mechanically and electrically connected to the current collecting portion (16, 18) and the terminal forming portion (15, 17) by welding. a wound electrode group formed by winding a layered member including a positive electrode, a negative electrode, and a separator, the positive electrode having an applied layer formed by applying a positive active material mixture to a first metal foil and an unapplied portion on which the positive active material mixture is not applied along the applied layer of the positive active material mixture, the negative electrode having an applied layer formed by applying a negative active material mixture to a second metal foil and an unapplied portion on which the negative active material mixture is not applied along the applied layer of the negative active material mixture, and the positive electrode and the negative electrode being layered via the separator such that the unapplied portion of the positive electrode and the unapplied portion of the negative electrode project in directions opposite to each other; a positive current collecting member welded to the unapplied portion of the positive electrode, the unapplied portion of the positive electrode projecting beyond the separator at one end portion of the wound electrode group; and a negative current collecting member welded to the unapplied portion of the negative electrode, the unapplied portion of the negative electrode projecting beyond the separator at the other end portion of the wound electrode group, and at least one of the positive current collecting member and the negative current collecting member comprising a terminal forming portion (15,17) configured to form a terminal and a current collecting portion (16,18) including a plurality of welded portions (33, 34) provided to face the unapplied portion (30, 32) and welded to a part of the unapplied portion (30, 32) by laser welding, a conductive member (35,36) is mechanically and electrically connected to the current collecting portion (16,18) and the terminal forming portion (15,17) to form, besides a current path passing directly through the current collecting portion (16,18) and the terminal forming portion (15,17) and bypassing the conductive member (35,36), another current path allowing a current to flow from a part of the current collecting portion (16,18) to the terminal forming portion (15,17) through the conductive member (35,36) while bypassing another part of the current collecting portion (16,18) characterized in that the conductive member (36, 50) is mechanically and electrically connected to the current collecting portion (16, 18) and the terminal forming portion (15, 17) by welding.