A 64-year-old woman presented with pain and swelling of the right lower abdomen. Abdominal enhanced computed tomography showed an abscess in the right inguinal canal extending from the cecum to the abdominal wall. Acute appendicitis with an abscess incarcerating into the right inguinal hernia, also called Amyandʼs hernia, was diagnosed. Appendectomy and hernioplasty without prosthesis were performed as an emergency surgery. Gangrenous appendicitis was confirmed on pathological examination. The abscess in the right inguinal canal was complicated and required drainage during the postoperative course. The patient was discharged 27 days after the surgery.