Although unsintered hydroxyapatite and poly-L-lactic acid (u-HA/PLLA) composite sheets have various applications, such as in craniomaxillofacial fractures, orthognathic surgery, and orthopedic surgery, and have been proven to be safe and effective, no studies have reported the use of u-HA/PLLA composite sheets for orbital wall reconstruction with long-term follow-up. This study reports our preliminary results using the u-HA/PLLA composite sheet for orbital wall fractures. The SuperFIXSORB MX sheet (u-HA/PLLA composite sheet; Takiron, Tokyo, Japan), with size of 30 × 50 mm and thickness of 0.5 mm, was used in all cases of hard reconstruction of the orbital bone defect. Seventy-two patients with acute orbital wall fractures (within 2 weeks after sustaining the injury) treated at the Jikei University between January 2014 and August 2016 were included. The authors evaluated the postoperative complications and the operability of the material. The authors did not observe any postoperative complications, such as infection, postoperative diplopia, or enophthalmos, due to the use of the u-HA/PLLA composite sheet. In pure orbital fractures (orbital fractures only), the mean (±standard deviation) operation time was significantly longer with combined inferior and medial wall fractures (201.1 ± 36.6 minutes; n = 11) than with inferior wall or medial wall fractures only (135.0 ± 54.4 minutes; n = 51) (Mann-Whitney U test, P < 0.001). The U-HA/PLLA composite sheet is safe and can be used for orbital wall fracture reconstruction. Further long-term functional and aesthetic assessments for infection, ocular movement disorder, enophthalmos, and any other complication are necessary.