A wire harness conduction inspection method performed by a computer comprising: determining whether wirings included in two wire harnesses arranged in adjacent divided areas are conducted by a connector that connects the two wire harnesses, based on - an actual wiring diagram that describes wirings to drive a certain electrical system mounted on a vehicle, - a matrix table that describes specification for a wire harness to identify the electrical system constituting a portion of a circuit, for each wire harness mounted on the vehicle, and - a connector diagram that describes a connector, a corresponding relationship between the connector and the wirings, and specification for the connector to identify the electrical system constituting the portion of the circuit; wherein the harness inspection method is characterized by the steps of: - detecting the connector that connects the two wire harnesses with reference to the actual wiring diagram; - specifying a pair of wire harnesses having common specification assigned to the wire harnesses among the wire harnesses wired in each of the adjacent divided areas with reference to the matrix table; - specifying the connector to which specification identical to the common specification of the pair of wire harnesses specified in the wire harness specification step is assigned with reference to the connector diagram; and - determining whether the wirings included in the two wire harnesses are conducted by the connector with reference to the connector diagram that describes the connector specified by the connector specification step and the actual wiring diagram that describes the wirings of the electrical system to which the common specification is assigned. determining whether wirings included in two wire harnesses arranged in adjacent divided areas are conducted by a connector that connects the two wire harnesses, based on - an actual wiring diagram that describes wirings to drive a certain electrical system mounted on a vehicle, - a matrix table that describes specification for a wire harness to identify the electrical system constituting a portion of a circuit, for each wire harness mounted on the vehicle, and - a connector diagram that describes a connector, a corresponding relationship between the connector and the wirings, and specification for the connector to identify the electrical system constituting the portion of the circuit; - an actual wiring diagram that describes wirings to drive a certain electrical system mounted on a vehicle, - a matrix table that describes specification for a wire harness to identify the electrical system constituting a portion of a circuit, for each wire harness mounted on the vehicle, and - a connector diagram that describes a connector, a corresponding relationship between the connector and the wirings, and specification for the connector to identify the electrical system constituting the portion of the circuit; wherein the harness inspection method is characterized by the steps of: - detecting the connector that connects the two wire harnesses with reference to the actual wiring diagram; - specifying a pair of wire harnesses having common specification assigned to the wire harnesses among the wire harnesses wired in each of the adjacent divided areas with reference to the matrix table; - specifying the connector to which specification identical to the common specification of the pair of wire harnesses specified in the wire harness specification step is assigned with reference to the connector diagram; and - determining whether the wirings included in the two wire harnesses are conducted by the connector with reference to the connector diagram that describes the connector specified by the connector specification step and the actual wiring diagram that describes the wirings of the electrical system to which the common specification is assigned. - detecting the connector that connects the two wire harnesses with reference to the actual wiring diagram; - specifying a pair of wire harnesses having common specification assigned to the wire harnesses among the wire harnesses wired in each of the adjacent divided areas with reference to the matrix table; - specifying the connector to which specification identical to the common specification of the pair of wire harnesses specified in the wire harness specification step is assigned with reference to the connector diagram; and - determining whether the wirings included in the two wire harnesses are conducted by the connector with reference to the connector diagram that describes the connector specified by the connector specification step and the actual wiring diagram that describes the wirings of the electrical system to which the common specification is assigned.