A wrench extender useful for extending both the reach and leverage of most double-ended wrenches. The extender includes a flat base with spaced clamping receptacles for receiving and securing a wrench handle, the receptacles selectively closed with clamping means locking the wrench handle in the receptacles with a compressive and/or frictional fit. The wrench is further secured by its inner non-free end in a downwardly-angled neck or relief connecting the wrench-supporting base and an aligned grip. In a first form, the neck is provided with a vertical stud for engaging the inner end of the wrench to prevent longitudinal shifting. In a second form, the neck terminates in a vertical wall adjacent the grip to longitudinally stop the inner end of the wrench.