To provide a testing method of a wire harness mounted parts without complication of testing operation and testing device, with few omission of testing.

A harness clip 21, fixed to the wire harness 1 by winding a tape 2, made of conductive resin as a whole, comprises a plate-shaped marginal part to be wound 22 and an anchor part 23 protruding from the center of the marginal part to be wound 22. A testing jig 31 comprises a jig main body 34 made of an insulation body on which a hole 33 having a mounting part 32 following the outer shape of the harness clip 21, electrodes 35 formed on the several parts of the mounting part 32 of the hole 33 of the jig main body 34, and an electrode 36 located at the center of the hole 33 so as to face the top end of the anchor part 23. Those electrodes 35, 36 are connected with a circuit checker 41. The circuit checker 41 measures contact, a resistance, and electrostatic capacity between the electrodes 35, 46 and the harness clip 21, and checks whether the proper harness clip 21 is mounted at the proper location.