diff --git a/app/Ejaculation.php b/app/Ejaculation.php
index 0f3522c..a270f40 100644
--- a/app/Ejaculation.php
+++ b/app/Ejaculation.php
@@ -12,6 +12,9 @@ class Ejaculation extends Model
 {
     use HasEagerLimit;
 
+    const SOURCE_WEB = 'web';
+    const SOURCE_CSV = 'csv';
+
     protected $fillable = [
         'user_id', 'ejaculated_date',
         'note', 'geo_latitude', 'geo_longitude', 'link',
diff --git a/app/Io/CheckinCsvImporter.php b/app/Io/CheckinCsvImporter.php
index 30d13d4..1239667 100644
--- a/app/Io/CheckinCsvImporter.php
+++ b/app/Io/CheckinCsvImporter.php
@@ -69,6 +69,7 @@ class CheckinCsvImporter
                 $ejaculation->ejaculated_date = Carbon::createFromFormat('!Y/m/d H:i+', $record['日時']);
                 $ejaculation->note = str_replace(["\r\n", "\r"], "\n", $record['ノート'] ?? '');
                 $ejaculation->link = $record['オカズリンク'] ?? '';
+                $ejaculation->source = Ejaculation::SOURCE_CSV;
 
                 try {
                     $tags = $this->parseTags($line, $record);
diff --git a/database/migrations/2020_02_17_085327_add_source_to_ejaculations.php b/database/migrations/2020_02_17_085327_add_source_to_ejaculations.php
new file mode 100644
index 0000000..965e398
--- /dev/null
+++ b/database/migrations/2020_02_17_085327_add_source_to_ejaculations.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddSourceToEjaculations extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('ejaculation_sources', function (Blueprint $table) {
+            $table->string('name');
+            $table->primary('name');
+        });
+        Schema::table('ejaculations', function (Blueprint $table) {
+            $table->string('source')->nullable();
+            $table->foreign('source')->references('name')->on('ejaculation_sources');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('ejaculations', function (Blueprint $table) {
+            $table->dropColumn('source');
+        });
+        Schema::drop('ejaculation_sources');
+    }
+}
diff --git a/database/seeds/DatabaseSeeder.php b/database/seeds/DatabaseSeeder.php
index e119db6..3f0fc32 100644
--- a/database/seeds/DatabaseSeeder.php
+++ b/database/seeds/DatabaseSeeder.php
@@ -11,6 +11,6 @@ class DatabaseSeeder extends Seeder
      */
     public function run()
     {
-        // $this->call(UsersTableSeeder::class);
+        $this->call(EjaculationSourcesSeeder::class);
     }
 }
diff --git a/database/seeds/EjaculationSourcesSeeder.php b/database/seeds/EjaculationSourcesSeeder.php
new file mode 100644
index 0000000..a762a08
--- /dev/null
+++ b/database/seeds/EjaculationSourcesSeeder.php
@@ -0,0 +1,19 @@
+<?php
+
+use Illuminate\Database\Seeder;
+
+class EjaculationSourcesSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        $sources = ['web', 'csv'];
+        foreach ($sources as $source) {
+            DB::table('ejaculation_sources')->insert(['name' => $source]);
+        }
+    }
+}
diff --git a/tests/Unit/Io/CheckinCsvImporterTest.php b/tests/Unit/Io/CheckinCsvImporterTest.php
index f3ecfb3..a486760 100644
--- a/tests/Unit/Io/CheckinCsvImporterTest.php
+++ b/tests/Unit/Io/CheckinCsvImporterTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Unit\Io;
 
+use App\Ejaculation;
 use App\Exceptions\CsvImportException;
 use App\Io\CheckinCsvImporter;
 use App\User;
@@ -13,6 +14,12 @@ class CheckinCsvImporterTest extends TestCase
 {
     use RefreshDatabase;
 
+    protected function setUp()
+    {
+        parent::setUp();
+        $this->seed();
+    }
+
     public function testIncompatibleCharsetEUCJP()
     {
         $user = factory(User::class)->create();
@@ -231,4 +238,16 @@ class CheckinCsvImporterTest extends TestCase
         $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/tag-multiline.utf8.csv');
         $importer->execute();
     }
+
+    public function testSourceIsCsv()
+    {
+        $user = factory(User::class)->create();
+
+        $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/date.utf8.csv');
+        $importer->execute();
+        $ejaculation = $user->ejaculations()->first();
+
+        $this->assertSame(1, $user->ejaculations()->count());
+        $this->assertEquals(Ejaculation::SOURCE_CSV, $ejaculation->source);
+    }
 }