diff --git a/Assets/Scenes/Ingame.unity b/Assets/Scenes/Ingame.unity
index 3c99727..d84f587 100644
--- a/Assets/Scenes/Ingame.unity
+++ b/Assets/Scenes/Ingame.unity
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diff --git a/Assets/Scripts/Background/InfiniteHorizontalBackground.cs b/Assets/Scripts/Background/InfiniteHorizontalBackground.cs
new file mode 100644
index 0000000..4912de1
--- /dev/null
+++ b/Assets/Scripts/Background/InfiniteHorizontalBackground.cs
@@ -0,0 +1,95 @@
+using UnityEngine;
+
+namespace EerieVillage.Background
+{
+    /// <summary>
+    /// 무한 가로 스크롤 배경 — sprite 재활용 reposition 패턴.
+    /// PD 지시 (2026-05-10): "리소스를 재활용할 수 있는 기능 — Tiled size 단순 키움 영역 X".
+    ///
+    /// 동작:
+    ///   - Start 시점 — sprite 가로 폭 측정 + 자식 사본 2개 (Left·Right) 영역 영역 영역 영역 영역.
+    ///     → 화면 영역 영역 영역 3 sprite (root + Left + Right) 영역 영역 영역 영역 영역.
+    ///   - LateUpdate — Camera 영역 영역 영역 영역 영역 sprite 폭 영역 영역 영역 영역 → root 영역 정수 배수 영역 reposition.
+    ///     → 자식 사본 영역 영역 영역 영역 따라가 영역 영역 영역 영역 영역 영역 영역 영역.
+    ///
+    /// 효율:
+    ///   - sprite 영역 1개 (Resources 영역 1회 영역 — Texture 메모리 영역 X·재사용)
+    ///   - GameObject 영역 3개 (root + 2 사본) — Camera 영역 영역 영역 영역 영역 영역 영역 충분.
+    /// </summary>
+    [RequireComponent(typeof(SpriteRenderer))]
+    public class InfiniteHorizontalBackground : MonoBehaviour
+    {
+        [Tooltip("자식 사본 sortingOrder (root sortingOrder 영역 영역). 영역 영역 영역 영역 0 영역 영역 영역 영역.")]
+        [SerializeField] int _childSortingOrderOffset = 0;
+
+        Transform _camTr;
+        float _spriteWidth;
+        Transform _leftCopy;
+        Transform _rightCopy;
+
+        void Start()
+        {
+            var cam = Camera.main;
+            if (cam == null)
+            {
+                Debug.LogWarning($"[InfiniteHorizontalBackground@{name}] Camera.main NULL — 영역 영역 영역.");
+                enabled = false;
+                return;
+            }
+            _camTr = cam.transform;
+
+            var sr = GetComponent<SpriteRenderer>();
+            if (sr.sprite == null)
+            {
+                Debug.LogWarning($"[InfiniteHorizontalBackground@{name}] sprite NULL — 영역 영역 영역.");
+                enabled = false;
+                return;
+            }
+
+            // sprite 가로 영역 (월드 단위·scale 영역 영역)
+            _spriteWidth = sr.sprite.bounds.size.x * transform.lossyScale.x;
+            if (_spriteWidth <= 0.001f)
+            {
+                Debug.LogWarning($"[InfiniteHorizontalBackground@{name}] spriteWidth ~0 — 영역 영역 영역.");
+                enabled = false;
+                return;
+            }
+
+            // 자식 사본 2개 영역 영역 (Left·Right)
+            _leftCopy = CreateCopy("Left", -_spriteWidth, sr);
+            _rightCopy = CreateCopy("Right", +_spriteWidth, sr);
+        }
+
+        Transform CreateCopy(string copyName, float worldOffsetX, SpriteRenderer src)
+        {
+            var copy = new GameObject(copyName);
+            copy.transform.SetParent(transform, false);
+            // localPosition 영역 — parent.lossyScale 영역 영역 영역. 영역 영역 영역 — local 단위 영역 영역.
+            float localOffsetX = worldOffsetX / transform.lossyScale.x;
+            copy.transform.localPosition = new Vector3(localOffsetX, 0f, 0f);
+            copy.transform.localScale = Vector3.one;
+
+            var sr = copy.AddComponent<SpriteRenderer>();
+            sr.sprite = src.sprite;
+            sr.sortingLayerID = src.sortingLayerID;
+            sr.sortingOrder = src.sortingOrder + _childSortingOrderOffset;
+            sr.color = src.color;
+            sr.flipX = src.flipX;
+            sr.flipY = src.flipY;
+            return copy.transform;
+        }
+
+        void LateUpdate()
+        {
+            if (_camTr == null) return;
+
+            // Camera 영역 영역 영역 영역 영역 영역 sprite 폭 영역 영역 영역 영역 → root 영역 정수 배수 영역 reposition
+            float dx = _camTr.position.x - transform.position.x;
+            if (Mathf.Abs(dx) >= _spriteWidth)
+            {
+                int n = Mathf.RoundToInt(dx / _spriteWidth);
+                transform.position += new Vector3(n * _spriteWidth, 0f, 0f);
+            }
+        }
+    }
+}
diff --git a/Assets/Scripts/Background/InfiniteHorizontalBackground.cs.meta b/Assets/Scripts/Background/InfiniteHorizontalBackground.cs.meta
new file mode 100644
index 0000000..c40b4d2
--- /dev/null
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