diff --git a/lib/tool_kit/cli/spec.ex b/lib/tool_kit/cli/spec.ex
index a36093a..6009258 100644
--- a/lib/tool_kit/cli/spec.ex
+++ b/lib/tool_kit/cli/spec.ex
@@ -21,7 +21,7 @@ defmodule ToolKit.CLI.Spec do
   defstruct [:tool_name, :tool_summary, :option_catalog, :global_option_names, :commands]
 
   @type option_def :: %{
-          type: :boolean | :string,
+          type: :boolean | :string | :integer,
           alias: atom() | nil,
           values: [String.t()] | nil,
           doc: String.t()
@@ -78,7 +78,7 @@ defmodule ToolKit.CLI.Spec do
   end
 
   @doc "OptionParser の strict リスト(全オプションの和集合)"
-  @spec strict_switches(t()) :: [{atom(), :boolean | :string}]
+  @spec strict_switches(t()) :: [{atom(), :boolean | :string | :integer}]
   def strict_switches(%__MODULE__{option_catalog: catalog}) do
     Enum.map(catalog, fn {name, %{type: type}} -> {name, type} end)
   end
@@ -206,7 +206,8 @@ defmodule ToolKit.CLI.Spec do
   end
 
   defp render_option_line(option) do
-    value = if option.type == :string, do: " #{render_values(option)}", else: ""
+    # 値を取る型(string / integer)には VALUE プレースホルダを表示する
+    value = if option.type == :boolean, do: "", else: " #{render_values(option)}"
 
     if single_char_name?(option.name) do
       "  -#{option.name}#{value}  #{option.doc}"
diff --git a/test/tool_kit/cli/spec_test.exs b/test/tool_kit/cli/spec_test.exs
index 3c554c6..458cdf4 100644
--- a/test/tool_kit/cli/spec_test.exs
+++ b/test/tool_kit/cli/spec_test.exs
@@ -1,6 +1,7 @@
 defmodule ToolKit.CLI.SpecTest do
   use ExUnit.Case, async: true
 
+  alias ToolKit.CLI.Parser
   alias ToolKit.CLI.Spec
   alias ToolKit.Test.RegistryManagerSpecFixture, as: Fixture
 
@@ -45,6 +46,37 @@ defmodule ToolKit.CLI.SpecTest do
       end
     end
 
+    test "integer options derive strict switches and render a VALUE placeholder" do
+      spec = %Spec{
+        tool_name: "demo",
+        tool_summary: "demo tool",
+        option_catalog: %{
+          help: %{type: :boolean, alias: :h, values: nil, doc: "help"},
+          jobs: %{type: :integer, alias: nil, values: nil, doc: "並列数"}
+        },
+        global_option_names: [:help],
+        commands: [
+          %{
+            name: "run",
+            aliases: [],
+            usage: ["run"],
+            summary: "run",
+            options: [:jobs],
+            examples: ["run --jobs 4"]
+          }
+        ]
+      }
+
+      assert {:jobs, :integer} in Spec.strict_switches(spec)
+      assert Spec.render_command_help(spec, "run") =~ "--jobs VALUE"
+      assert Spec.validate_opts(spec, "run", jobs: 4) == :ok
+
+      # 整数でない値の拒否は OptionParser(strict)の責務で、
+      # Parser がパース段階のエラーに変換する
+      assert {:error, message} = Parser.parse(spec, ["run", "--jobs", "four"])
+      assert message =~ "--jobs"
+    end
+
     test "command option overrides replace values and doc", %{spec: spec} do
       list_command = Spec.find_command(spec, "list")
       sort = spec |> Spec.options_for(list_command) |> Enum.find(&(&1.name == :sort))