One embodiment of an improved piano tuning hammer which eliminates the tilting force which, when a tuner operates a conventional "L"-shaped tuning hammer, invariably accompanies the application of a turning force to a tuning pin mounted in a pin block. The improved hammer has an overall shape like the letter "C," so that its handle lies substantially in the plane of the pin block, allowing the tuner to turn the pin without tilting it. The embodiment presented is lightweight and rigid, and clears the case structures of most pianos.