Abstract: A hammer assembly having means for holding a nail includes a hammer and a nail holder. The nail holder is detachably mounted to the hammer to expose its one part or entirety outside an external surface of the hammer. When the nail holder is separated from the hammer, the nail holder can be used for holding a nail which is to be hit by the hammer. In this way, the user does not need to hold the nail by his or her hand to prevent the user's hand from any accidental hit of the hammer. Besides, when the nail holder is not needed, the user can mount it to the hammer. Therefore, the hammer assembly can be operated safely and stored conveniently.