A busbar module (10, 10A) including: a case configured to be attached to a battery assembly including a plurality of single cells; a busbar supported by the case and configured to be electrically connected to an electrode of each of the plurality of single cells of the battery assembly; and a plurality of electric wires configured to be routed in the case, wherein the case is provided with a plurality of electric wire routing grooves (31A, 31B, (33A-33C) configured to accommodate and route the plurality of electric wires, the plurality of electric wire routing grooves (31A, 31B, 33A-33C) intersecting with and being connected to one another; wherein the plurality of electric wire routing grooves (31A, 31B, 33A-33C) include: a first electric wire routing groove portion and a second electric wire routing groove portion provided in parallel with each other and extending from a first end to a second end of the case in a longitudinal direction of the case; and a plurality of electric wire passing portions (33A-33C) each connecting the first electric wire routing groove portion and the second electric wire routing groove portion with each other, wherein at least a part of the plurality of electric wires is configured to be bent at a connection portion of the plurality of electric wire routing grooves (31A, 31B, 33A-33C) at which one of the plurality of electric wire passing portions (33A-33C) is connected to one of the first and second electric wire routing groove portions (31A, 31B); and wherein the connection portion is provided with: a wire locking portion configured to lock the at least a part of the plurality of electric wires at a side of a bent portion of the at least a part of the plurality of electric wires, the connection portion is further provided with: a guide taper on a corner portion of the connection portion to bent a portion of the at least a part of the plurality of electric wires, the guide taper being configured to guide the at least a part of the plurality of electric wires such that a routing direction of the plurality of electric wires can be easily grasped by using the guide taper as a mark, characterized in that the connection portion is provided with a guide rib configured to regulate a routing direction of the at least a part of the plurality of electric wires and to guide the at least a part of the plurality of electric wires to a predetermined routing route, the guide taper is formed at the corner portion where the guide rib is provided, and the guide rib protrudes from the guide taper. a case configured to be attached to a battery assembly including a plurality of single cells; a busbar supported by the case and configured to be electrically connected to an electrode of each of the plurality of single cells of the battery assembly; and a plurality of electric wires configured to be routed in the case, wherein the case is provided with a plurality of electric wire routing grooves (31A, 31B, (33A-33C) configured to accommodate and route the plurality of electric wires, the plurality of electric wire routing grooves (31A, 31B, 33A-33C) intersecting with and being connected to one another; wherein the plurality of electric wire routing grooves (31A, 31B, 33A-33C) include: a first electric wire routing groove portion and a second electric wire routing groove portion provided in parallel with each other and extending from a first end to a second end of the case in a longitudinal direction of the case; and a plurality of electric wire passing portions (33A-33C) each connecting the first electric wire routing groove portion and the second electric wire routing groove portion with each other, wherein at least a part of the plurality of electric wires is configured to be bent at a connection portion of the plurality of electric wire routing grooves (31A, 31B, 33A-33C) at which one of the plurality of electric wire passing portions (33A-33C) is connected to one of the first and second electric wire routing groove portions (31A, 31B); and wherein the connection portion is provided with: a wire locking portion configured to lock the at least a part of the plurality of electric wires at a side of a bent portion of the at least a part of the plurality of electric wires, the connection portion is further provided with: a guide taper on a corner portion of the connection portion to bent a portion of the at least a part of the plurality of electric wires, the guide taper being configured to guide the at least a part of the plurality of electric wires such that a routing direction of the plurality of electric wires can be easily grasped by using the guide taper as a mark, characterized in that the connection portion is provided with a guide rib configured to regulate a routing direction of the at least a part of the plurality of electric wires and to guide the at least a part of the plurality of electric wires to a predetermined routing route, the guide taper is formed at the corner portion where the guide rib is provided, and the guide rib protrudes from the guide taper.