A 39-year-old man was referred to Hirosaki University Hospital because of recurrent pulmonary embolism (PE) in spite of post insertion of a Greenfield inferior vena caval (IVC) filter with an anticoagulant agent. Although many examinations were performed in order to confirm the pathophysiology, we could not clarify the cause of PE. We decided on implanting an additional vena caval filter (Simon nitinol IVC filter) above the renal vein in this patient and administered oral anticogulants (Warfarin potassium, beraprost sodium, and sarpogrelate hydrochloride). We maintained an international normalized ratio (INR) of 2.5-3.0 and reduced the intravenous administration of heparin and he was discharged without recurrent PE. We think that further examination of thrombophilic tendency, including gene abnormality, will be necessary.