NOVELTY - The apparatus (10) has wire housing portion (11) that is provided with several elongated grooves (111-115)which are divided into several grooves (1D-3D) such that sidewalls (1F,1R) sandwiching the divided groove (1D) are coupled by coupling element (11U). A terminal housing chamber (12) houses a conductive metal plate to couple terminal of battery and terminal of adjacent battery, and couples adjacent chambers (121,122) by U-shaped elastic coupling element (12U). An extracting apparatus (13) couples groove (111) and chamber (121) to extract wire (W) to groove.    USE - Wiring apparatus used for electric vehicle mounting lithium ion battery.    ADVANTAGE - The sidewalls of divided wire housing grooves are coupled by U-shaped elastic coupling element, hence the tolerance of the battery pitch can be compensated by the shrink or expansion of the coupling element and design error of printed circuit board (PCB) assembly attached to battery module can be eliminated. The voltage detection wire housing portions is prevented from stress, hence the service life time of strong voltage detection wire housing portions is extended. The wire housed within the wire housing portion is prevented from extruding from the housing groove accidentally, so that the wires can be housed stably and so an unexpected accident does not arise. The attachment angle of the connector can be coped flexibly, because the attachment angle of the connector can be changed. The wiring apparatus eliminates the need for provision of overcurrent prevention resistor element for each of the cells of lithium ion batteries, hence the total cost of the apparatus is reduced.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of wiring apparatus.    Divided grooves of wire housing portion (1D-3D)    Sidewalls of divided groove (1F,1R)    Wiring apparatus (10)    Wire housing portion (11)    U-shaped elastic coupling element (11U,12U)    Terminal housing chambers (12,121,122)    Voltage detection wire extracting apparatus (13)    Wire housing grooves (111-115)    Voltage detection wire (W)