diff --git a/TIASshot/Cameras/CameraBase.cs b/TIASshot/Cameras/CameraBase.cs
index 17f0c56..c543cde 100644
--- a/TIASshot/Cameras/CameraBase.cs
+++ b/TIASshot/Cameras/CameraBase.cs
@@ -56,8 +56,8 @@
         public CameraBase(Form1 form) {
             _form = form;
             UpdateRate = Config.GetFloat("Calib/UpdateRate");
-            var tccSrgb = LoadMatFromCsv(Config.GetString("File/TccSrgbRef"));
-            var tccXyz = LoadMatFromCsv(Config.GetString("File/TccXyzRef"));
+            var tccSrgb = IoUtil.LoadMatFromCsv(Config.GetString("File/TccSrgbRef"));
+            var tccXyz = IoUtil.LoadMatFromCsv(Config.GetString("File/TccXyzRef"));
             _colorCorrector = new ColorCorrector(tccSrgb, tccXyz);
             _chartDetector = new ChartDetector(_form.ShowMessage);
         }
@@ -91,7 +91,7 @@
             SetInfo("データ名", _form.GetDataName());
             SetInfo("撮影枚数", "1");
             Shot();
-            EventSound(Config.GetString("Sound/OneShotDone"));
+            IoUtil.PlaySound(Config.GetString("Sound/OneShotDone"));
             _form.ShowMessage("撮影終了");
         }
 
@@ -104,7 +104,7 @@
             SetInfo("撮影枚数", $"{_form.GetNumMultiShots()}");
             SetInfo("撮影間隔(ms)", $"{_form.GetMultiShotsInterval()}");
             Shot(_form.GetNumMultiShots(), _form.GetMultiShotsInterval());
-            EventSound(Config.GetString("Sound/MultiShotDone"));
+            IoUtil.PlaySound(Config.GetString("Sound/MultiShotDone"));
             _form.ShowMessage("撮影終了");
         }
 
@@ -189,9 +189,9 @@
             Cv2.ImWrite(Path.Combine(_saveFolder, Config.GetString("File/TccRoisImage")), imgRois);
 
             // 変換行列の計算・保存は ColorCorrector に委譲する
-            _colorCorrector.CalcTcc(tccRgb, _saveFolder, SaveMatToCsv);
+            _colorCorrector.CalcTcc(tccRgb, _saveFolder, IoUtil.SaveMatToCsv);
 
-            EventSound(Config.GetString("Sound/CalibDone"));
+            IoUtil.PlaySound(Config.GetString("Sound/CalibDone"));
             _form.ShowMessage("自動校正完了");
             _form.EnableShots();
             _calibrated = true;
@@ -238,69 +238,11 @@
         }
 
         /// <summary>
-        /// csvファイルからMatを読み込む
-        /// </summary>
-        /// <param name="csvFile"></param>
-        /// <returns></returns>
-        /// <exception cref="Exception"></exception>
-        private Mat LoadMatFromCsv(string csvFile) {
-            try {
-                var arr = new List<double[]>();
-                int cols = -1;
-                using (var reader = new StreamReader(csvFile)) {
-                    while (!reader.EndOfStream) {
-                        var line = reader.ReadLine();
-                        var valStrs = line.Split(',');
-                        if (cols == -1) cols = valStrs.Length;
-                        else if (cols != valStrs.Length) throw new Exception("cols != valStrs.Length");
-                        var vals = valStrs.Select(x => double.Parse(x)).ToArray();
-                        arr.Add(vals);
-                    }
-                }
-                var m = new Mat(arr.Count, cols, MatType.CV_64FC1);
-                for (var row = 0; row < arr.Count; row++) {
-                    for (var col = 0; col < cols; col++) {
-                        m.At<double>(row, col) = arr[row][col];
-                    }
-                }
-                return m;
-            } catch (Exception) {
-                return null;
-            }
-        }
-
-        /// <summary>
-        /// Matをcsvファイルに保存
-        /// </summary>
-        /// <param name="m"></param>
-        /// <param name="csvFile"></param>
-        private void SaveMatToCsv(string csvFile, Mat m) {
-            using (var writer = new StreamWriter(csvFile)) {
-                for (var row = 0; row < m.Rows; row++) {
-                    var line = "";
-                    for (var col = 0; col < m.Cols; col++) {
-                        if (col > 0) line += ",";
-                        line += $"{m.At<double>(row, col):0.0000000}";
-                    }
-                    writer.WriteLine(line);
-                }
-            }
-        }
-
-        /// <summary>
         /// 保存フォルダの取得
         /// </summary>
-        /// <param name="isSeries"></param>
-        /// <returns></returns>
+        /// <param name="note"></param>
         protected void SetSaveFolder(string note) {
-            var dt = DateTime.Now;
-            var paths = new List<string>() {
-                Config.GetString("File/SaveFolder"),
-                dt.ToString("yyyy-MM-dd"),
-                dt.ToString("HH_mm_ss") + $"-{note}",
-            };
-            _saveFolder = Path.Combine(paths.ToArray());
-            Directory.CreateDirectory(_saveFolder);
+            _saveFolder = IoUtil.CreateSaveFolder(note);
         }
 
         /// <summary>
@@ -321,24 +263,7 @@
         /// </summary>
         /// <param name="sw"></param>
         protected void WriteInfo(StreamWriter sw) {
-            sw.WriteLine($"撮影日時,{DateTime.Now:yyyy/MM/dd HH:mm:ss}"); // 撮影日時を追加
-            foreach (var kvp in _ShotInfo) {
-                sw.WriteLine($"{kvp.Key},{kvp.Value}");
-            }
-        }
-
-        private void EventSound(string wavfile) {
-            if (!File.Exists(wavfile)) {
-                Debug.WriteLine($"音声ファイルが見つかりません: {wavfile}");
-                return;
-            }
-            try {
-                using (var player = new SoundPlayer(wavfile)) {
-                    player.Play();
-                }
-            } catch (Exception ex) {
-                Debug.WriteLine($"音声再生に失敗しました: {ex.Message}");
-            }
+            IoUtil.WriteInfo(sw, _ShotInfo);
         }
     }
 }
diff --git a/TIASshot/TIASshot.csproj b/TIASshot/TIASshot.csproj
index 3da5606..17d62b6 100644
--- a/TIASshot/TIASshot.csproj
+++ b/TIASshot/TIASshot.csproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\packages\OpenCvSharp4.runtime.win.4.10.0.20241108\build\net48\OpenCvSharp4.runtime.win.props" Condition="Exists('..\packages\OpenCvSharp4.runtime.win.4.10.0.20241108\build\net48\OpenCvSharp4.runtime.win.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
@@ -122,6 +122,7 @@
     <Compile Include="ChartDetection\ChartDetector.cs" />
     <Compile Include="ColorCorrection\ColorCorrector.cs" />
     <Compile Include="Config.cs" />
+    <Compile Include="Utils\IoUtil.cs" />
     <Compile Include="UI\Form1.cs">
       <SubType>Form</SubType>
     </Compile>
diff --git a/TIASshot/Utils/IoUtil.cs b/TIASshot/Utils/IoUtil.cs
new file mode 100644
index 0000000..0d7c41e
--- /dev/null
+++ b/TIASshot/Utils/IoUtil.cs
@@ -0,0 +1,113 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Media;
+using OpenCvSharp;
+
+namespace TIASshot {
+    /// <summary>
+    /// ファイル I/O（CSV 読み書き・保存フォルダ生成・撮影情報出力）とサウンド再生の
+    /// ユーティリティ．CameraBase から委譲される．状態を持たない．
+    /// </summary>
+    internal static class IoUtil {
+
+        /// <summary>
+        /// csvファイルからMatを読み込む
+        /// </summary>
+        /// <param name="csvFile"></param>
+        /// <returns></returns>
+        /// <exception cref="Exception"></exception>
+        public static Mat LoadMatFromCsv(string csvFile) {
+            try {
+                var arr = new List<double[]>();
+                int cols = -1;
+                using (var reader = new StreamReader(csvFile)) {
+                    while (!reader.EndOfStream) {
+                        var line = reader.ReadLine();
+                        var valStrs = line.Split(',');
+                        if (cols == -1) cols = valStrs.Length;
+                        else if (cols != valStrs.Length) throw new Exception("cols != valStrs.Length");
+                        var vals = valStrs.Select(x => double.Parse(x)).ToArray();
+                        arr.Add(vals);
+                    }
+                }
+                var m = new Mat(arr.Count, cols, MatType.CV_64FC1);
+                for (var row = 0; row < arr.Count; row++) {
+                    for (var col = 0; col < cols; col++) {
+                        m.At<double>(row, col) = arr[row][col];
+                    }
+                }
+                return m;
+            } catch (Exception) {
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// Matをcsvファイルに保存
+        /// </summary>
+        /// <param name="csvFile"></param>
+        /// <param name="m"></param>
+        public static void SaveMatToCsv(string csvFile, Mat m) {
+            using (var writer = new StreamWriter(csvFile)) {
+                for (var row = 0; row < m.Rows; row++) {
+                    var line = "";
+                    for (var col = 0; col < m.Cols; col++) {
+                        if (col > 0) line += ",";
+                        line += $"{m.At<double>(row, col):0.0000000}";
+                    }
+                    writer.WriteLine(line);
+                }
+            }
+        }
+
+        /// <summary>
+        /// 保存フォルダを生成し，そのパスを返す
+        /// </summary>
+        /// <param name="note"></param>
+        /// <returns>生成した保存フォルダのパス</returns>
+        public static string CreateSaveFolder(string note) {
+            var dt = DateTime.Now;
+            var paths = new List<string>() {
+                Config.GetString("File/SaveFolder"),
+                dt.ToString("yyyy-MM-dd"),
+                dt.ToString("HH_mm_ss") + $"-{note}",
+            };
+            var saveFolder = Path.Combine(paths.ToArray());
+            Directory.CreateDirectory(saveFolder);
+            return saveFolder;
+        }
+
+        /// <summary>
+        /// 設定値をCSVファイルに書き込む
+        /// </summary>
+        /// <param name="sw"></param>
+        /// <param name="info"></param>
+        public static void WriteInfo(StreamWriter sw, Dictionary<string, string> info) {
+            sw.WriteLine($"撮影日時,{DateTime.Now:yyyy/MM/dd HH:mm:ss}"); // 撮影日時を追加
+            foreach (var kvp in info) {
+                sw.WriteLine($"{kvp.Key},{kvp.Value}");
+            }
+        }
+
+        /// <summary>
+        /// 効果音を再生する
+        /// </summary>
+        /// <param name="wavfile"></param>
+        public static void PlaySound(string wavfile) {
+            if (!File.Exists(wavfile)) {
+                Debug.WriteLine($"音声ファイルが見つかりません: {wavfile}");
+                return;
+            }
+            try {
+                using (var player = new SoundPlayer(wavfile)) {
+                    player.Play();
+                }
+            } catch (Exception ex) {
+                Debug.WriteLine($"音声再生に失敗しました: {ex.Message}");
+            }
+        }
+    }
+}