diff --git a/library/train_util.py b/library/train_util.py
index 62d82c44..b8feac74 100644
--- a/library/train_util.py
+++ b/library/train_util.py
@@ -2740,18 +2740,21 @@ def load_tokenizer(args: argparse.Namespace):
 
 def prepare_accelerator(args: argparse.Namespace):
     if args.logging_dir is None:
-        log_with = None
         logging_dir = None
     else:
-        log_with = "tensorboard" if args.log_with is None else args.log_with
-        if log_with in ["wandb", "all"]:
-            try:
-                import wandb
-            except ImportError:
-                raise ImportError("No wandb / wandb がインストールされていないようです")
         log_prefix = "" if args.log_prefix is None else args.log_prefix
         logging_dir = args.logging_dir + "/" + log_prefix + time.strftime("%Y%m%d%H%M%S", time.localtime())
 
+    log_with = "tensorboard" if args.log_with is None else args.log_with
+    if log_with in ["wandb", "all"]:
+        if logging_dir is not None:
+            os.makedirs(logging_dir)
+            os.environ["WANDB_DIR"] = logging_dir
+        try:
+            import wandb
+        except ImportError:
+            raise ImportError("No wandb / wandb がインストールされていないようです")
+
     accelerator = Accelerator(
         gradient_accumulation_steps=args.gradient_accumulation_steps,
         mixed_precision=args.mixed_precision,