To provide a wiring harness branch clamp that can be arranged at the center in a branch when branching a branch wire from a group of electric wires in the wiring harness for wiring, and can be adapted to every branch form without being restricted by the number of branches.

The wire harness branch clamp fixes a branch in the wiring harness, and has first and second clamps 12, 13. The first clamp has: a substrate 15 arranged at the lower side of the branch; a post 16 that is installed vertically on the upper surface of the substrate and passes through nearly the center of the branch in the wiring harness; and a plurality of elastically deformable locking sections 17 that are radially enlarged in a tapered shape from the tip side to the base end side on the outer-periphery surface of the post and are formed from the tip side toward the base end side. The second clamp is a planar member having a through hole 13a where the post passes through while elastically deforming the locking section, and can lock the locking section of the first clamp.

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