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diff --git a/src/arrow/ruby/red-arrow/lib/arrow/decimal256-data-type.rb b/src/arrow/ruby/red-arrow/lib/arrow/decimal256-data-type.rb
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+++ b/src/arrow/ruby/red-arrow/lib/arrow/decimal256-data-type.rb
@@ -0,0 +1,73 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+module Arrow
+  class Decimal256DataType
+    MAX_PRECISION = max_precision
+
+    alias_method :initialize_raw, :initialize
+    private :initialize_raw
+
+    # Creates a new {Arrow::Decimal256DataType}.
+    #
+    # @overload initialize(precision, scale)
+    #
+    #   @param precision [Integer] The precision of the decimal data
+    #     type. It's the number of digits including the number of
+    #     digits after the decimal point.
+    #
+    #   @param scale [Integer] The scale of the decimal data
+    #     type. It's the number of digits after the decimal point.
+    #
+    #   @example Create a decimal data type for "XXXXXX.YY" decimal
+    #     Arrow::Decimal256DataType.new(8, 2)
+    #
+    # @overload initialize(description)
+    #
+    #   @param description [Hash] The description of the decimal data
+    #     type. It must have `:precision` and `:scale` values.
+    #
+    #   @option description [Integer] :precision The precision of the
+    #     decimal data type. It's the number of digits including the
+    #     number of digits after the decimal point.
+    #
+    #   @option description [Integer] :scale The scale of the decimal
+    #     data type. It's the number of digits after the decimal
+    #     point.
+    #
+    #   @example Create a decimal data type for "XXXXXX.YY" decimal
+    #     Arrow::Decimal256DataType.new(precision: 8,
+    #                                   scale: 2)
+    #
+    # @since 3.0.0
+    def initialize(*args)
+      n_args = args.size
+      case n_args
+      when 1
+        description = args[0]
+        precision = description[:precision]
+        scale = description[:scale]
+      when 2
+        precision, scale = args
+      else
+        message = "wrong number of arguments (given, #{n_args}, expected 1..2)"
+        raise ArgumentError, message
+      end
+      initialize_raw(precision, scale)
+    end
+  end
+end