diff --git a/file.go b/file.go
index 9ce13f8..78020f3 100644
--- a/file.go
+++ b/file.go
@@ -40,3 +40,11 @@ func fileCreate(filepath string) {
 		logger("fileCreate : unknown -> " + filepath)
 	}
 }
+
+func fileMkDir(folderpath string) {
+	_, err := os.Stat(folderpath)
+	if errors.Is(err, os.ErrNotExist) {
+		err = os.Mkdir(folderpath, 0755)
+		errorPanic(err)
+	}
+}
diff --git a/logger.go b/logger.go
index 52fedfa..1d0ba66 100644
--- a/logger.go
+++ b/logger.go
@@ -1,13 +1,11 @@
 package main
 
 import (
-	"os"
 	"time"
 )
 
 func logger(input string) {
-	err := os.Mkdir("./log", 0755)
-	errorPanic(err)
+	fileMkDir("./log")
 	println("[" + time.Now().Format("15:04:05") + "] " + input)
 	fileAddLine("["+time.Now().Format("15:04:05")+"] "+input, "./log/"+time.Now().Format("2006-02-01")+".log")
 }