diff --git a/src/spaceone/cost_analysis/manager/cost_manager.py b/src/spaceone/cost_analysis/manager/cost_manager.py
index a256c72..c28f57d 100644
--- a/src/spaceone/cost_analysis/manager/cost_manager.py
+++ b/src/spaceone/cost_analysis/manager/cost_manager.py
@@ -142,7 +142,7 @@ class CostSummaryItem(BaseModel):
                         data['usage_unit'] = 'Count'
                         data['additional_info']['Usage Type Details'] = 'HTTPS Requests'
                     elif usage_type.find('-Out-Bytes') > 0:
-                        data['usage_unit'] = 'Bytes'
+                        data['usage_unit'] = 'GB'
                         data['additional_info']['Usage Type Details'] = 'Transfer Out'
                     else:
                         data['usage_unit'] = 'Count'