diff --git a/src/app/navi/services/scanner.service.ts b/src/app/navi/services/scanner.service.ts
index 62d24de..51a1717 100644
--- a/src/app/navi/services/scanner.service.ts
+++ b/src/app/navi/services/scanner.service.ts
@@ -11,35 +11,34 @@ import { TileDatabaseService } from './tile-database.service';
   providedIn: 'root',
 })
 export class ScannerService {
-  private classifier?: DonjaraTileScanner;
+  private classifier: DonjaraTileScanner = new DonjaraTileScanner();
 
   constructor(private tileDatabaseService: TileDatabaseService) {}
 
   async initialize() {
-    this.classifier = new DonjaraTileScanner({
+    await this.classifier.initialize({
       modelBaseUrl: environment.modelBaseUrl,
     });
-    await this.classifier.initialize();
   }
 
   public getCameraPreviewStream() {
-    return this.classifier!.getPreviewMediaStream();
+    return this.classifier.getPreviewMediaStream();
   }
 
   public get onScanned$() {
-    return this.classifier!.onScanned$;
+    return this.classifier.onScanned$;
   }
 
   public get onDetectionStatusChanged$() {
-    return this.classifier!.onDetectionStatusChanged$;
+    return this.classifier.onDetectionStatusChanged$;
   }
 
   async onVideoFrame(videoElement: HTMLVideoElement) {
-    await this.classifier!.onVideoFrame(videoElement);
+    await this.classifier.onVideoFrame(videoElement);
   }
 
   async detect() {
-    return this.classifier!.detect();
+    return this.classifier.detect();
   }
 
   async getCgTilesByScannerResult(
diff --git a/src/app/shared/classes/donjara-tile-scanner/donjara-tile-scanner.ts b/src/app/shared/classes/donjara-tile-scanner/donjara-tile-scanner.ts
index 79b3eb5..fd91853 100644
--- a/src/app/shared/classes/donjara-tile-scanner/donjara-tile-scanner.ts
+++ b/src/app/shared/classes/donjara-tile-scanner/donjara-tile-scanner.ts
@@ -50,7 +50,13 @@ export class DonjaraTileScanner {
   // パイの表面領域の分類器
   private tileClassifier!: TileClassifier;
 
-  constructor(params: { modelBaseUrl: string }) {
+  constructor() {}
+
+  async initialize(params: { modelBaseUrl: string }) {
+    if (this.previewCanvas) {
+      return;
+    }
+
     this.tileDetector = new TileDetector({
       modelBaseUrl: params.modelBaseUrl,
     });
@@ -58,12 +64,6 @@ export class DonjaraTileScanner {
     this.tileClassifier = new TileClassifier({
       modelBaseUrl: params.modelBaseUrl,
     });
-  }
-
-  async initialize() {
-    if (this.previewCanvas) {
-      return;
-    }
 
     // プレビュー映像生成用キャンバスを初期化
     this.previewCanvas = document.createElement('canvas');