This paper describes a new type of tapping touch gesture called different-finger tap. We classified four tapping gestures as expanding tap gestures and performed a user experiment to investigate their tapping speed and error count during button touch interaction together with the different-finger tap gesture. The results showed that the different-finger tap gesture led to faster tapping time than the long-tap gesture and a lower error count than that seen with the double-tap gesture, although users were required to perform complex mental activities to use the different-finger tap gesture because it was unfamiliar. Participants reported that the different-finger tap gesture was the most suitable for tasks that require the tapping of small buttons correctly and quickly, such as text entry, when it was used together with the single-tap gesture.