diff --git a/lib/fluent/plugin/bigquery/schema.rb b/lib/fluent/plugin/bigquery/schema.rb
index 0f1d285..7f30d04 100644
--- a/lib/fluent/plugin/bigquery/schema.rb
+++ b/lib/fluent/plugin/bigquery/schema.rb
@@ -116,6 +116,16 @@ def format_one(value, is_load: false)
       end
     end
 
+    class BigNumericFieldSchema < FieldSchema
+      def type
+        :bignumeric
+      end
+
+      def format_one(value, is_load: false)
+        value.to_s
+      end
+    end    
+
     class BooleanFieldSchema < FieldSchema
       def type
         :boolean
@@ -200,6 +210,7 @@ class RecordSchema < FieldSchema
         integer: IntegerFieldSchema,
         float: FloatFieldSchema,
         numeric: NumericFieldSchema,
+        bignumeric: BigNumericFieldSchema,
         boolean: BooleanFieldSchema,
         timestamp: TimestampFieldSchema,
         date: DateFieldSchema,
diff --git a/test/plugin/test_record_schema.rb b/test/plugin/test_record_schema.rb
index bc1ac79..8950628 100644
--- a/test/plugin/test_record_schema.rb
+++ b/test/plugin/test_record_schema.rb
@@ -32,6 +32,11 @@ def base_schema
         "name" => "utilisation",
         "type" => "NUMERIC",
         "mode" => "NULLABLE"
+      },
+      {
+        "name" => "bigutilisation",
+        "type" => "BIGNUMERIC",
+        "mode" => "NULLABLE"
       }
     ]
   end
@@ -72,6 +77,11 @@ def base_schema_with_new_column
         "name" => "new_column",
         "type" => "STRING",
         "mode" => "REQUIRED"
+      },
+      {
+        "name" => "bigutilisation",
+        "type" => "BIGNUMERIC",
+        "mode" => "NULLABLE"
       }
     ]
   end
@@ -107,6 +117,11 @@ def base_schema_with_type_changed_column
         "name" => "utilisation",
         "type" => "NUMERIC",
         "mode" => "NULLABLE"
+      },
+      {
+        "name" => "bigutilisation",
+        "type" => "BIGNUMERIC",
+        "mode" => "NULLABLE"
       }
     ]
   end
@@ -157,12 +172,12 @@ def test_format_one_convert_array_or_hash_to_json
     time = Time.local(2016, 2, 7, 19, 0, 0).utc
 
     formatted = fields.format_one({
-      "time" => time, "tty" => ["tty1", "tty2", "tty3"], "pwd" => "/home", "user" => {name: "joker1007", uid: 10000}, "argv" => ["foo", 42], "utilisation" => "0.837"
+      "time" => time, "tty" => ["tty1", "tty2", "tty3"], "pwd" => "/home", "user" => {name: "joker1007", uid: 10000}, "argv" => ["foo", 42], "utilisation" => "0.837", "bigutilisation" => "0.837"
     })
     assert_equal(
       formatted,
       {
-        "time" => time.strftime("%Y-%m-%d %H:%M:%S.%6L %:z"), "tty" => MultiJson.dump(["tty1", "tty2", "tty3"]), "pwd" => "/home", "user" => MultiJson.dump({name: "joker1007", uid: 10000}), "argv" => ["foo", "42"], "utilisation" => "0.837"
+        "time" => time.strftime("%Y-%m-%d %H:%M:%S.%6L %:z"), "tty" => MultiJson.dump(["tty1", "tty2", "tty3"]), "pwd" => "/home", "user" => MultiJson.dump({name: "joker1007", uid: 10000}), "argv" => ["foo", "42"], "utilisation" => "0.837", "bigutilisation" => "0.837"
       }
     )
   end