A 75-year-old man underwent transabdominal preperitoneal repair (TAPP) for bilateral inguinal hernias in our hospital in 2019. On postoperative day 7, he returned to the hospital complaining of vomiting. Computed tomography showed an intestinal obstruction originating in the left inguinal region, postoperative adhesive intestinal obstruction was diagnosed, and a transnasal long intestinal tube was inserted for decompression. Since the obstruction was not resolved after decompression, surgery was performed. Laparoscopic observation showed dehiscence of the medial end of the peritoneal suture in the left inguinal region, and the small intestine was adhering to the exposed mesh. Without removing the mesh, this small bowel adhesion was detached, and the area of peritoneal dehiscence was resutured, after which an adhesion barrier was inserted to complete the procedure. Resection of the small intestine where the adhesion was detached was not required. Because intestinal obstruction due to peritoneal suture dehiscence may occur following TAPP, every effort must be made to ensure that the closure is strong and without gaps.