A staple gun includes a base seat having a pivot shaft and a coupling shaft, a striking member disposed movably in the base seat and having a connecting hole, an elastic member engaging the connecting hole, a driving member having a slot and a linking hole that is engaged with the elastic member, and a handle. The driving member is inclined with a lower portion thereof being disposed in front of an upper portion thereof. The handle has a cam surface, and an engaging hole retaining the pivot shaft. Pivot movement of the handle toward a pressed position deforms the elastic member resiliently and moves the handle rearwardly due to a slidable contact between the cam surface and the coupling shaft.

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