Acute massive pulmonary thromboembolism (PE) has a high mortality rate of 18%–65%. Along with anticoagulation and thrombolytic therapy, treatment may require a catheter-based thrombectomy or surgical thrombectomy. We report a case of pulmonary thromboembolism treated with a Stent Retriever (Trevo® NXT ProVue Retriever, Stryker, Kalamazoo, MI, USA), which is commonly used to treat stroke. An 81-year-old woman complained of back pain and was transported to our hospital after she became unconscious. Cardiopulmonary resuscitation was initiated before her arrival at the hospital; she returned to spontaneous circulation after arrival. After undergoing computed tomography (CT) scanning, she went into cardiac arrest again, and we established veno-arterial extracorporeal membrane oxygenation and performed catheter thrombectomy using a stent retriever. The left basilar pulmonary artery and the right middle pulmonary artery trunk were retrieved after the stent's deployment, and bilateral pulmonary arteries were confirmed to be reopened. A residual thrombus was present, and Monteplase was administered. A contrast-enhanced CT scan taken on day 15 following admission revealed that the thrombus had disappeared, and echocardiography revealed improved right ventricular dysfunction. The patient was transferred to another hospital on day 64 for rehabilitation. We report the first case of pulmonary artery thrombosis that was successfully recanalized by endovascular treatment with a stent retriever. The stent retriever may be useful as an endovascular treatment device for PE because it is easier to achieve recanalization using this method compared to conventional treatment methods.