diff --git a/library/config_util.py b/library/config_util.py
index e8e0fda7c..ab90fb63b 100644
--- a/library/config_util.py
+++ b/library/config_util.py
@@ -51,6 +51,7 @@ class BaseSubsetParams:
   image_dir: Optional[str] = None
   num_repeats: int = 1
   shuffle_caption: bool = False
+  caption_separator: str = ',',
   keep_tokens: int = 0
   color_aug: bool = False
   flip_aug: bool = False
diff --git a/library/train_util.py b/library/train_util.py
index cc9ac4555..9fb616ed6 100644
--- a/library/train_util.py
+++ b/library/train_util.py
@@ -349,6 +349,7 @@ def __init__(
         image_dir: Optional[str],
         num_repeats: int,
         shuffle_caption: bool,
+        caption_separator: str,
         keep_tokens: int,
         color_aug: bool,
         flip_aug: bool,
@@ -365,6 +366,7 @@ def __init__(
         self.image_dir = image_dir
         self.num_repeats = num_repeats
         self.shuffle_caption = shuffle_caption
+        self.caption_separator = caption_separator
         self.keep_tokens = keep_tokens
         self.color_aug = color_aug
         self.flip_aug = flip_aug
@@ -391,6 +393,7 @@ def __init__(
         caption_extension: str,
         num_repeats,
         shuffle_caption,
+        caption_separator: str,
         keep_tokens,
         color_aug,
         flip_aug,
@@ -410,6 +413,7 @@ def __init__(
             image_dir,
             num_repeats,
             shuffle_caption,
+            caption_separator,
             keep_tokens,
             color_aug,
             flip_aug,
@@ -443,6 +447,7 @@ def __init__(
         metadata_file: str,
         num_repeats,
         shuffle_caption,
+        caption_separator,
         keep_tokens,
         color_aug,
         flip_aug,
@@ -462,6 +467,7 @@ def __init__(
             image_dir,
             num_repeats,
             shuffle_caption,
+            caption_separator,
             keep_tokens,
             color_aug,
             flip_aug,
@@ -492,6 +498,7 @@ def __init__(
         caption_extension: str,
         num_repeats,
         shuffle_caption,
+        caption_separator,
         keep_tokens,
         color_aug,
         flip_aug,
@@ -511,6 +518,7 @@ def __init__(
             image_dir,
             num_repeats,
             shuffle_caption,
+            caption_separator,
             keep_tokens,
             color_aug,
             flip_aug,
@@ -646,7 +654,7 @@ def process_caption(self, subset: BaseSubset, caption):
             caption = ""
         else:
             if subset.shuffle_caption or subset.token_warmup_step > 0 or subset.caption_tag_dropout_rate > 0:
-                tokens = [t.strip() for t in caption.strip().split(",")]
+                tokens = [t.strip() for t in caption.strip().split(subset.caption_separator)]
                 if subset.token_warmup_step < 1:  # 初回に上書きする
                     subset.token_warmup_step = math.floor(subset.token_warmup_step * self.max_train_steps)
                 if subset.token_warmup_step and self.current_step < subset.token_warmup_step:
@@ -3105,7 +3113,10 @@ def add_dataset_arguments(
     # dataset common
     parser.add_argument("--train_data_dir", type=str, default=None, help="directory for train images / 学習画像データのディレクトリ")
     parser.add_argument(
-        "--shuffle_caption", action="store_true", help="shuffle comma-separated caption / コンマで区切られたcaptionの各要素をshuffleする"
+        "--shuffle_caption", action="store_true", help="shuffle separated caption / 区切られたcaptionの各要素をshuffleする"
+    )
+    parser.add_argument(
+        "--caption_separator", type=str, default=",", help="separator for caption / captionの区切り文字"
     )
     parser.add_argument(
         "--caption_extension", type=str, default=".caption", help="extension of caption files / 読み込むcaptionファイルの拡張子"