diff --git a/ch07/train_seq2seq.py b/ch07/train_seq2seq.py
index 167d703f..883dfd02 100644
--- a/ch07/train_seq2seq.py
+++ b/ch07/train_seq2seq.py
@@ -24,14 +24,14 @@
 # ハイパーパラメータの設定
 vocab_size = len(char_to_id)
 wordvec_size = 16
-hideen_size = 128
+hidden_size = 128
 batch_size = 128
 max_epoch = 25
 max_grad = 5.0
 
 # Normal or Peeky? ==============================================
-model = Seq2seq(vocab_size, wordvec_size, hideen_size)
-# model = PeekySeq2seq(vocab_size, wordvec_size, hideen_size)
+model = Seq2seq(vocab_size, wordvec_size, hidden_size)
+# model = PeekySeq2seq(vocab_size, wordvec_size, hidden_size)
 # ================================================================
 optimizer = Adam()
 trainer = Trainer(model, optimizer)