To naturally drive a nail into a driven material without damaging the material even in a narrow part.

A contact arm 15 for a driving tool is vertically movably provided along an ejection passage of a nose part 4 that is provided to the lower part of a tool body 2 and drives nails. The tip of the contact arm is protruded farther than the tip of the nose part 4. The operation of a trigger is made effective by moving the contact arm upward relatively to the nose part 4 during the driving. The nose part 4 is composed of a thin-walled wear plate 9 joined integrally with the tool body and a thin-walled driver guide 8 joined to the front part of the wear plate 9. The tip member 17 of the contact arm 15 is arranged freely slidably along the rear face of the wear plate 9. An elastic contact top 18 is fixed to the external side face of the tip of the tip member 17.