diff --git a/main.py b/main.py
index 6f4c98d..d4b47f4 100644
--- a/main.py
+++ b/main.py
@@ -4,9 +4,12 @@
 import os
 import shutil
 
-# lattice=Trueでテーブルの軸線でセルを判定
-os.mkdir("./files")
-os.mkdir("./output_files")
+if not os.path.exists("./files"):
+    os.mkdir("./files")
+
+if not os.path.exists("./output_files"):
+    os.mkdir("./output_files")
+
 dfs = tabula.read_pdf("000876235.pdf", lattice=True, pages='all', pandas_options={'header': None})
 i = 0
 for df in dfs: