diff --git a/PythonProj/ScanOCR/スクリプト/logger.py b/PythonProj/ScanOCR/スクリプト/logger.py
new file mode 100644
index 00000000..839a46ea
--- /dev/null
+++ b/PythonProj/ScanOCR/スクリプト/logger.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+"""実行ログ出力モジュール。日付別ファイル・UTF-8 BOM付き。"""
+from __future__ import annotations
+
+from datetime import datetime
+from pathlib import Path
+from typing import Callable
+
+LOG_ENCODING = "utf-8-sig"
+
+
+def log_path_for_today(
+    log_dir: Path, now_func: Callable[[], datetime] = datetime.now
+) -> Path:
+    return log_dir / f"{now_func().strftime('%Y-%m-%d')}.log"
+
+
+def append_log(
+    log_dir: Path,
+    result: str,
+    original_filename: str,
+    name: str | None,
+    date: str | None,
+    note: str = "",
+    now_func: Callable[[], datetime] = datetime.now,
+) -> None:
+    log_dir.mkdir(parents=True, exist_ok=True)
+    now = now_func()
+    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"
+    )
+    path = log_path_for_today(log_dir, now_func)
+    with open(path, "a", encoding=LOG_ENCODING) as f:
+        f.write(line)
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
new file mode 100644
index 00000000..eabfb4f1
--- /dev/null
+++ b/PythonProj/ScanOCR/スクリプト/tests/test_logger.py
@@ -0,0 +1,65 @@
+from datetime import datetime
+
+from logger import LOG_ENCODING, append_log, log_path_for_today
+
+
+def fixed_now():
+    return datetime(2026, 8, 2, 10, 30, 15)
+
+
+def test_log_path_for_today_uses_now_func(tmp_path):
+    result = log_path_for_today(tmp_path, now_func=fixed_now)
+    assert result == tmp_path / "2026-08-02.log"
+
+
+def test_append_log_creates_dir_and_file(tmp_path):
+    log_dir = tmp_path / "ログ"
+
+    append_log(
+        log_dir,
+        result="成功",
+        original_filename="scan001.pdf",
+        name="山田太郎",
+        date="20260802",
+        note="",
+        now_func=fixed_now,
+    )
+
+    log_path = log_dir / "2026-08-02.log"
+    assert log_path.exists()
+
+    content = log_path.read_text(encoding=LOG_ENCODING)
+    assert "[2026-08-02 10:30:15]" in content
+    assert "結果=成功" in content
+    assert "元ファイル=scan001.pdf" in content
+    assert "氏名=山田太郎" in content
+    assert "日付=20260802" in content
+
+
+def test_append_log_handles_none_name_and_date(tmp_path):
+    log_dir = tmp_path / "ログ"
+
+    append_log(
+        log_dir,
+        result="失敗",
+        original_filename="scan002.pdf",
+        name=None,
+        date=None,
+        note="抽出不十分",
+        now_func=fixed_now,
+    )
+
+    content = (log_dir / "2026-08-02.log").read_text(encoding=LOG_ENCODING)
+    assert "氏名=" in content
+    assert "日付=" in content
+    assert "備考=抽出不十分" in content
+
+
+def test_append_log_appends_multiple_lines(tmp_path):
+    log_dir = tmp_path / "ログ"
+
+    append_log(log_dir, "成功", "a.pdf", "氏名A", "20260801", "", now_func=fixed_now)
+    append_log(log_dir, "成功", "b.pdf", "氏名B", "20260802", "", now_func=fixed_now)
+
+    content = (log_dir / "2026-08-02.log").read_text(encoding=LOG_ENCODING)
+    assert content.count("結果=成功") == 2