Temporalis muscle transfer is an example of regional muscle transfer [1,2]. There are also ways to use a fascia lata graft to adjust the traction vector during muscle transfer [3]. This report describes temporal muscle transfer using the mandibular periosteum and partial temporalis detachment without a fascia lata graft to perform reconstruction in a patient with incomplete facial nerve palsy. First, the temporalis muscle was exposed through a temporal incision and the anterior third of the temporalis was detached from the temporal bone. Next, an intraoral incision was made to create an exposure from the mandibular coronoid process to the mandibular body. The periosteum was dissected from the mandibular body to the coronoid process connecting with the temporalis fascia. A saw was used to cut the coronoid process. The piece of the coronoid process connected to the temporalis was pulled to test whether the detached temporalis glided in the pulling direction. Maintaining the optimal shape of the nasolabial fold, the distal end of the periosteum was anchored to the muscle of the nasolabial fold through subcutaneous tunneling (Figs. 1, 2). The outcomes measured were preoperative and postoperative patient photographs (Fig. 3). The mouth corner showed improved symmetry in the resting state. Temporal area hollowness was not observed. The traditional temporalis muscle transfer technique uses a fascia lata graft to adjust the magnitude of the vector that exerts traction on the mouth corner. The technique introduced in this report enables adjustment of the magnitude of the vector applied to the mouth corner through partial temporalis detachment and by connecting the mandibular periosteum to the temporalis fascia. This technique produces satisfying cosmetic outcomes without the need for an additional donor site for fascia lata harvest.