A handheld tool structure includes a tool member, a handle, a cover and a connecting peg. The handle is barrel-shaped and has an opening at an end of the handle. An end of the tool member is slab-shaped and the tool member has at least one penetrating hole and at least one notch. An end of the connecting peg has a slender groove, and the top of the cover has a slender slot. An end of the tool member is passed through the slot of the cover and inserted into the groove of the connecting peg, and the cover and the connecting peg are connected, and another end of the connecting peg is plugged into the handle from an opening at an end of the handle, and the cover is plugged into the handle until the top of the cover is aligned evenly with a distal surface of the handle.