To evaluate the anti-angiogenic efficacy of CB-12181 [an azasugar derivative that has inhibitory actions against matrix metalloproteinases (MMPs) and tumor necrosis factor-α (TNF-α) converting enzyme (TACE)], we investigated the suppressing ability on in vitro (tube formation by endothelial cells) and in vivo (retinal neovascularization on murine ischemia-induced proliferative retinopathy) models of angiogenesis. For in vitro analysis, a capillary-like tube formation model using human umbilical vein endothelial cells (HUVECs) and fibroblasts co-culture assay was employed. Tube formation of HUVECs was stimulated by vascular endothelial growth factor (VEGF) and incubated with different concentrations of CB-12181 (0.1 – 100 μM) for 11 days. For in vivo analysis, mice were exposed to 75% oxygen between postnatal days 7 and 12 (P7 to P12). Then, the mice were removed from the oxygen treatment and treated with CB-12181 (1, 15, or 50 mg/kg) by daily subcutaneous injection from the time of reintroduction to room air at P12 until P16. At P17, pathological and physiological angiogenesis was quantified using retinal flat-mounts visualized by fluorescent angiography. In the in vitro angiogenesis model, CB-12181 significantly suppressed VEGF-induced HUVEC tube formation. Furthermore, in the in vivo angiogenesis model, administration of CB-12181 significantly suppressed retinal neovascularization without any apparent side effects on physiological revascularization to the oxygen-induced obliteration area. These results suggest that CB-12181 might be useful in the treatment of various diseases that depend on pathologic angiogenesis, and especially valuable for the treatment of diabetic retinopathy and retinopathy of prematurity.