diff --git a/TimeBank_account/migrations/0003_auto_20210518_1607.py b/TimeBank_account/migrations/0003_auto_20210518_1607.py
new file mode 100644
index 0000000..a6e2f50
--- /dev/null
+++ b/TimeBank_account/migrations/0003_auto_20210518_1607.py
@@ -0,0 +1,20 @@
+# Generated by Django 3.1.7 on 2021-05-18 16:07
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('TimeBank_account', '0002_auto_20210518_1544'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='account',
+            name='user',
+            field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
+        ),
+    ]
diff --git a/TimeBank_account/models.py b/TimeBank_account/models.py
index 24f0591..a580909 100644
--- a/TimeBank_account/models.py
+++ b/TimeBank_account/models.py
@@ -65,7 +65,7 @@ class Meta:
 # 계좌 모델
 class Account(models.Model):
     account_no = models.CharField(max_length=20, verbose_name='계좌번호')
-    user = models.ForeignKey(User, unique=True, on_delete=models.CASCADE)
+    user = models.OneToOneField(User, on_delete=models.CASCADE)
     balance = models.IntegerField(default=0, verbose_name='잔액')
 
     @classmethod