A 56-year-old male patient had suffered from recurrent oral aphthae, acne-like rashes on the face, an erythema nodosum-like rash on the left lower leg, and severe heel pain on the left-hand side. Colonoscopy revealed six ulcerative lesions in the terminal ileum. Ultrasonography and magnetic resonance imaging showed an inflammatory lesion in the Achilles tendons, with greater inflammation on the left. Achilles tendonitis was considered to be a peripheral enthesopathy in this patient with Behçet's disease complicated by an ileal ulcer.