Laravel8 Faktory error

Laravelのバージョン８でSeedersとFactoryを使ってテストコードを作りたいのですが、下記のエラーが出てしまいました。
なぜBlogFacrotyは読みこまれないのでしょうか？

Seeding: Database\Seeders\BlogsTableSeeder

   Error 

  Class 'Database\Factories\BlogFactory' not found

  at vendor/laravel/framework/src/Illuminate/Database/Eloquent/Factories/Factory.php:650
    646▕     public static function factoryForModel(string $modelName)
    647▕     {
    648▕         $factory = static::resolveFactoryName($modelName);
    649▕ 
  ➜ 650▕         return $factory::new();
    651▕     }
    652▕ 
    653▕     /**
    654▕      * Specify the callback that should be invoked to guess factory names based on dynamic relationship names.

      +1 vendor frames 
  2   database/seeders/BlogsTableSeeder.php:17
      App\Models\Blog::factory()

      +8 vendor frames 
  11  database/seeders/DatabaseSeeder.php:18
      Illuminate\Database\Seeder::call("Database\Seeders\BlogsTableSeeder")

database/seeders/BlogsTableSeeders.php

php
1<?php
2
3namespace Database\Seeders;
4
5use Illuminate\Database\Seeder;
6use App\Models\Blog;
7
8class BlogsTableSeeder extends Seeder
9{
10    /**
11     * Run the database seeds.
12     *
13     * @return void
14     */
15    public function run()
16    {
17        \App\Models\Blog::factory()->create(); 
18    }
19}
20

database/factories/BlogFactory.php

php
1<?php
2
3namespace Database\Factories;
4
5use App\Models\Blog;
6use Illuminate\Database\Eloquent\Factories\Factory;
7
8class ModelFactory extends Factory
9{
10    /**
11     * The name of the factory's corresponding model.
12     *
13     * @var string
14     */
15    protected $model = Blog::class;
16
17    /**
18     * Define the model's default state.
19     *
20     * @return array
21     */
22    public function definition()
23    {
24        return [
25            //
26            'title' => $this->faker->text(50),
27            'content' => $this->faker->text(200)
28        ];
29    }
30}
31

Models/Blog.php

php
1<?php
2
3namespace App\Models;
4
5use Illuminate\Database\Eloquent\Factories\HasFactory;
6use Illuminate\Database\Eloquent\Model;
7
8class Blog extends Model
9{
10    use HasFactory;
11    //テーブル名
12    protected $table = 'blogs';
13
14    //可変項目
15    protected $fillable = 
16    [
17        'title',
18        'content'
19    ];
20}
21