diff --git a/PythonProj/ScanOCR/スクリプト/extract_and_rename.py b/PythonProj/ScanOCR/スクリプト/extract_and_rename.py
index 5a8bcec6..46a35a63 100644
--- a/PythonProj/ScanOCR/スクリプト/extract_and_rename.py
+++ b/PythonProj/ScanOCR/スクリプト/extract_and_rename.py
@@ -283,17 +283,24 @@ def main() -> None:
         stable_wait_sec = float(config["ファイル安定待ち秒"])
         stable_retries = int(config["ファイル安定待ちリトライ回数"])
 
-        run_queue(
-            folders["スキャンフォルダ"],
-            folders["アウトプットフォルダ"],
-            folders["成功フォルダ"],
-            folders["失敗フォルダ"],
-            folders["ログフォルダ"],
-            boxes,
-            margin,
-            stable_wait_sec,
-            stable_retries,
-        )
+        try:
+            run_queue(
+                folders["スキャンフォルダ"],
+                folders["アウトプットフォルダ"],
+                folders["成功フォルダ"],
+                folders["失敗フォルダ"],
+                folders["ログフォルダ"],
+                boxes,
+                margin,
+                stable_wait_sec,
+                stable_retries,
+            )
+        except Exception as e:
+            append_log(
+                folders["ログフォルダ"], "エラー", "-", None, None,
+                f"予期しないエラーで処理を中断しました: {type(e).__name__}: {e}",
+            )
+            print(f"予期しないエラーが発生しました: {e}")
     finally:
         release_lock(lock_path)
 
diff --git a/PythonProj/ScanOCR/スクリプト/logger.py b/PythonProj/ScanOCR/スクリプト/logger.py
index 839a46ea..d7bf48aa 100644
--- a/PythonProj/ScanOCR/スクリプト/logger.py
+++ b/PythonProj/ScanOCR/スクリプト/logger.py
@@ -26,10 +26,11 @@ def append_log(
 ) -> None:
     log_dir.mkdir(parents=True, exist_ok=True)
     now = now_func()
+    flat_note = note.replace("\r\n", " ").replace("\n", " ").replace("\r", " ")
     line = (
         f"[{now.strftime('%Y-%m-%d %H:%M:%S')}] "
         f"結果={result} | 元ファイル={original_filename} | "
-        f"氏名={name or ''} | 日付={date or ''} | 備考={note}\n"
+        f"氏名={name or ''} | 日付={date or ''} | 備考={flat_note}\n"
     )
     path = log_path_for_today(log_dir, now_func)
     with open(path, "a", encoding=LOG_ENCODING) as f:
diff --git a/PythonProj/ScanOCR/スクリプト/tests/test_logger.py b/PythonProj/ScanOCR/スクリプト/tests/test_logger.py
index eabfb4f1..43fc4eb5 100644
--- a/PythonProj/ScanOCR/スクリプト/tests/test_logger.py
+++ b/PythonProj/ScanOCR/スクリプト/tests/test_logger.py
@@ -55,6 +55,26 @@ def test_append_log_handles_none_name_and_date(tmp_path):
     assert "備考=抽出不十分" in content
 
 
+def test_append_log_flattens_multiline_note(tmp_path):
+    log_dir = tmp_path / "ログ"
+
+    append_log(
+        log_dir,
+        result="エラー",
+        original_filename="scan003.pdf",
+        name=None,
+        date=None,
+        note="RuntimeError: OCRエラー\nTraceback (most recent call last):\n  line 1",
+        now_func=fixed_now,
+    )
+
+    content = (log_dir / "2026-08-02.log").read_text(encoding=LOG_ENCODING)
+    lines = content.splitlines()
+    assert len(lines) == 1
+    assert "\n" not in lines[0]
+    assert "RuntimeError: OCRエラー" in lines[0]
+
+
 def test_append_log_appends_multiple_lines(tmp_path):
     log_dir = tmp_path / "ログ"