Preeclampsia is often complicated by visual disorder, but retinal detachment is comparably rare. We experienced two cases of serous retinal detachment in life-threatening placental abruption and preeclampsia. Both patients complained of visual disorder after the onset of placental abruption. Magnetic resonance imaging, scanning laser ophthalmoscopy, and optical coherence tomography were useful in the diagnosis of serous retinal detachment, which spontaneously resolved after several months in both cases. In a severe case of placental abruption, serous retinal detachment should be considered if the patient has disordered vision, although the prognosis is typically good.