Pregnancy and puerperium are at increased risk of venous thromboembolism（VTE）, including deep vein thrombosis（DVT）and pulmonary thromboembolism（PTE）. In case 1 who developed VTE in the first trimester of pregnancy, an inferior vena cava（IVC）filter was temporarily placed due to coexistence of PTE, but the IVC filter could be removed after anticoagulant therapy, and vaginal delivery was successful. In case 2 who developed VTE in the third trimester of pregnancy, labor has onset before confirming the disappearance of the iliac vein DVT, and the temporary IVC filter was placed immediately before vaginal delivery. Since the mechanism of VTE onset and the time to delivery are different between the first trimester and third trimester, management of DVT, such as IVC filter placement, is also different during each pregnancy period.