diff --git a/frontend/components/numbering-rule/NumberingRuleDesigner.tsx b/frontend/components/numbering-rule/NumberingRuleDesigner.tsx
index bfdb69c2..b23d85de 100644
--- a/frontend/components/numbering-rule/NumberingRuleDesigner.tsx
+++ b/frontend/components/numbering-rule/NumberingRuleDesigner.tsx
@@ -8,7 +8,7 @@ import { Label } from "@/components/ui/label";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Plus, Save, Edit2, Trash2 } from "lucide-react";
 import { toast } from "sonner";
-import { NumberingRuleConfig, NumberingRulePart } from "@/types/numbering-rule";
+import { NumberingRuleConfig, NumberingRulePart, SEPARATOR_OPTIONS, SeparatorType } from "@/types/numbering-rule";
 import { NumberingRuleCard } from "./NumberingRuleCard";
 import { NumberingRulePreview } from "./NumberingRulePreview";
 import {
@@ -47,6 +47,10 @@ export const NumberingRuleDesigner: React.FC<NumberingRuleDesignerProps> = ({
   const [rightTitle, setRightTitle] = useState("규칙 편집");
   const [editingLeftTitle, setEditingLeftTitle] = useState(false);
   const [editingRightTitle, setEditingRightTitle] = useState(false);
+  
+  // 구분자 관련 상태
+  const [separatorType, setSeparatorType] = useState<SeparatorType>("-");
+  const [customSeparator, setCustomSeparator] = useState("");
 
   useEffect(() => {
     loadRules();
@@ -87,6 +91,50 @@ export const NumberingRuleDesigner: React.FC<NumberingRuleDesignerProps> = ({
     }
   }, [currentRule, onChange]);
 
+  // currentRule이 변경될 때 구분자 상태 동기화
+  useEffect(() => {
+    if (currentRule) {
+      const sep = currentRule.separator ?? "-";
+      // 빈 문자열이면 "none"
+      if (sep === "") {
+        setSeparatorType("none");
+        setCustomSeparator("");
+        return;
+      }
+      // 미리 정의된 구분자인지 확인 (none, custom 제외)
+      const predefinedOption = SEPARATOR_OPTIONS.find(
+        opt => opt.value !== "custom" && opt.value !== "none" && opt.displayValue === sep
+      );
+      if (predefinedOption) {
+        setSeparatorType(predefinedOption.value);
+        setCustomSeparator("");
+      } else {
+        // 직접 입력된 구분자
+        setSeparatorType("custom");
+        setCustomSeparator(sep);
+      }
+    }
+  }, [currentRule?.ruleId]); // ruleId가 변경될 때만 실행 (규칙 선택/생성 시)
+
+  // 구분자 변경 핸들러
+  const handleSeparatorChange = useCallback((type: SeparatorType) => {
+    setSeparatorType(type);
+    if (type !== "custom") {
+      const option = SEPARATOR_OPTIONS.find(opt => opt.value === type);
+      const newSeparator = option?.displayValue ?? "";
+      setCurrentRule((prev) => prev ? { ...prev, separator: newSeparator } : null);
+      setCustomSeparator("");
+    }
+  }, []);
+
+  // 직접 입력 구분자 변경 핸들러
+  const handleCustomSeparatorChange = useCallback((value: string) => {
+    // 최대 2자 제한
+    const trimmedValue = value.slice(0, 2);
+    setCustomSeparator(trimmedValue);
+    setCurrentRule((prev) => prev ? { ...prev, separator: trimmedValue } : null);
+  }, []);
+
   const handleAddPart = useCallback(() => {
     if (!currentRule) return;
 
@@ -372,7 +420,44 @@ export const NumberingRuleDesigner: React.FC<NumberingRuleDesignerProps> = ({
                 </div>
               </div>
 
-              {/* 두 번째 줄: 자동 감지된 테이블 정보 표시 */}
+              {/* 두 번째 줄: 구분자 설정 */}
+              <div className="flex items-end gap-3">
+                <div className="w-48 space-y-2">
+                  <Label className="text-sm font-medium">구분자</Label>
+                  <Select
+                    value={separatorType}
+                    onValueChange={(value) => handleSeparatorChange(value as SeparatorType)}
+                  >
+                    <SelectTrigger className="h-9">
+                      <SelectValue placeholder="구분자 선택" />
+                    </SelectTrigger>
+                    <SelectContent>
+                      {SEPARATOR_OPTIONS.map((option) => (
+                        <SelectItem key={option.value} value={option.value}>
+                          {option.label}
+                        </SelectItem>
+                      ))}
+                    </SelectContent>
+                  </Select>
+                </div>
+                {separatorType === "custom" && (
+                  <div className="w-32 space-y-2">
+                    <Label className="text-sm font-medium">직접 입력</Label>
+                    <Input
+                      value={customSeparator}
+                      onChange={(e) => handleCustomSeparatorChange(e.target.value)}
+                      className="h-9"
+                      placeholder="최대 2자"
+                      maxLength={2}
+                    />
+                  </div>
+                )}
+                <p className="text-muted-foreground pb-2 text-xs">
+                  규칙 사이에 들어갈 문자입니다
+                </p>
+              </div>
+
+              {/* 세 번째 줄: 자동 감지된 테이블 정보 표시 */}
               {currentTableName && (
                 <div className="space-y-2">
                   <Label className="text-sm font-medium">적용 테이블</Label>
diff --git a/frontend/types/numbering-rule.ts b/frontend/types/numbering-rule.ts
index 9cd81bdb..c44e2354 100644
--- a/frontend/types/numbering-rule.ts
+++ b/frontend/types/numbering-rule.ts
@@ -123,3 +123,24 @@ export const RESET_PERIOD_OPTIONS: Array<{
   { value: "monthly", label: "월별 초기화" },
   { value: "yearly", label: "연별 초기화" },
 ];
+
+/**
+ * 구분자 옵션
+ * - 규칙과 규칙 사이에 들어가는 문자
+ * - "none"은 구분자 없음
+ * - "custom"은 직접 입력 (최대 2자)
+ */
+export type SeparatorType = "none" | "-" | "_" | "." | "/" | "custom";
+
+export const SEPARATOR_OPTIONS: Array<{
+  value: SeparatorType;
+  label: string;
+  displayValue: string;
+}> = [
+  { value: "none", label: "없음", displayValue: "" },
+  { value: "-", label: "하이픈 (-)", displayValue: "-" },
+  { value: "_", label: "언더스코어 (_)", displayValue: "_" },
+  { value: ".", label: "점 (.)", displayValue: "." },
+  { value: "/", label: "슬래시 (/)", displayValue: "/" },
+  { value: "custom", label: "직접입력", displayValue: "" },
+];