diff --git a/csrestructuredquery/query.py b/csrestructuredquery/query.py
index 2837ae8..3f91155 100644
--- a/csrestructuredquery/query.py
+++ b/csrestructuredquery/query.py
@@ -59,3 +59,7 @@ class And(LogicalExpression):
 
 class Or(LogicalExpression):
     name = "or"
+
+
+class Not(LogicalExpression):
+    name = "not"
diff --git a/tests/test_query.py b/tests/test_query.py
index d2336a6..1b970d4 100644
--- a/tests/test_query.py
+++ b/tests/test_query.py
@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from csrestructuredquery.query import Query, And, Or
+from csrestructuredquery.query import Query, And, Or, Not
 
 
 def test_文字列型と日時型は引用符で括られる():
@@ -16,3 +16,8 @@ def test_AND論理演算子():
 def test_OR論理演算子():
     expr = Or(("foo", "hoge"), ("bar", 123))
     assert expr.query() == "(or foo:'hoge' bar:123)"
+
+
+def test_NOT論理演算子():
+    expr = Not(("foo", "hoge"), ("bar", 123))
+    assert expr.query() == "(not foo:'hoge' bar:123)"