A 64-year-old woman with glaucoma had suprachoroidal hemorrhage approximately 6 hours after trabeculectomy. High-frequency ultrasonography revealed high reflectivity in the inner space of a kissing choroidal detachment, which facilitated the differential diagnosis of suprachoroidal hemorrhage resulting from serous choroidal detachment. The ciliary process and iris were anteriorly displaced due to the ciliary detachment and forward pressure of the anterior vitreous. On the basis of the diagnosis, transscleral choroidal drainage was performed without delay and the patient's vision was preserved. After surgery, suprachoroidal hemorrhage disappeared clinically, but high-frequency ultrasonography detected persistence of the choroidal detachment in the peripheral area.