To provide an electric wire holder in which a part of cables are not easily extracted.

If an electric wire holder 1 is fit in a notch Q, an air gap 17 is kept, and a ground wire A can be held by passing it through here. After the ground wire A is held at an electric wire holder 1, by passing this through the roughly triangular air gap 17, it is preferable to fit this electric wire holder 1 in the notch Q. Since the ground wire A cannot be removed if the electric wire holder 1 is extracted from the notch Q, a failure such that the ground wire A may be removed or displaced in error can be prevented. Further, since a plate P is sheet metal, both can be made to conduct in properly, by welding the ground wire A held at the air gap 17 to the plate P in pressure welding.