diff --git a/www/js/plugins/LL_InfoPopupWIndowMV.js b/www/js/plugins/LL_InfoPopupWIndowMV.js
index e6c21ba..135c3d1 100644
--- a/www/js/plugins/LL_InfoPopupWIndowMV.js
+++ b/www/js/plugins/LL_InfoPopupWIndowMV.js
@@ -14,6 +14,11 @@
  * @author ルルの教会
  * @url https://nine-yusha.com/plugin-infowindow/
  *
+ * @param FontSize
+ * @text Font Size
+ * @desc ポップアップで表示するテキストのフォントサイズ（ピクセル）。既定値は24。
+ * @default 24
+ *
  * @help LL_InfoPopupWIndowMV.js
  *
  * ポップアップでインフォメッセージを表示します。
@@ -50,6 +55,8 @@
     "use strict";
     var pluginName = "LL_InfoPopupWIndowMV";
     var parameters = PluginManager.parameters(pluginName);
+    // Font size for info popup text (uses Window_Base default if not set)
+    var exInfoWindowFontSize = Number(parameters['FontSize'] || 20);
 
     //-----------------------------------------------------------------------------
 	// PluginCommand (for MV)
@@ -251,12 +258,36 @@
     };
 
     Window_ExInfoWindow.prototype.refresh = function() {
-        this.contents.clear();
-        this.drawTextEx(exInfoWindowText, 0, 0, this.innerWidth);
+        var self = this;
+        // Use a temporary override so drawTextEx uses the plugin-configured font size
+        var _origReset = Window_Base.prototype.resetFontSettings;
+        Window_Base.prototype.resetFontSettings = function() {
+            this.contents.fontFace = this.standardFontFace();
+            this.contents.fontSize = exInfoWindowFontSize;
+            this.resetTextColor();
+        };
+        try {
+            this.contents.clear();
+            // draw text with temporary font size
+            Window_Base.prototype.drawTextEx.call(this, exInfoWindowText, 0, 0);
+        } finally {
+            Window_Base.prototype.resetFontSettings = _origReset;
+        }
     };
 
     // for MV
     Window_ExInfoWindow.prototype.textWidthEx = function(text) {
-        return this.drawTextEx(text, 0, this.contents.height);
+        // Ensure text width is measured with the configured font size.
+        var _origReset = Window_Base.prototype.resetFontSettings;
+        Window_Base.prototype.resetFontSettings = function() {
+            this.contents.fontFace = this.standardFontFace();
+            this.contents.fontSize = exInfoWindowFontSize;
+            this.resetTextColor();
+        };
+        try {
+            return Window_Base.prototype.drawTextEx.call(this, text, 0, this.contents.height);
+        } finally {
+            Window_Base.prototype.resetFontSettings = _origReset;
+        }
     };
 })();