diff --git a/part01/.editorconfig b/part01/.editorconfig
new file mode 100644
index 0000000..8f0c87a
--- /dev/null
+++ b/part01/.editorconfig
@@ -0,0 +1,7 @@
+[*.cr]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
diff --git a/part01/.gitignore b/part01/.gitignore
new file mode 100644
index 0000000..dabb3a1
--- /dev/null
+++ b/part01/.gitignore
@@ -0,0 +1,5 @@
+/doc/
+/lib/
+/bin/
+/.shards/
+!/.vscode/
\ No newline at end of file
diff --git a/part01/.travis.yml b/part01/.travis.yml
new file mode 100644
index 0000000..ffc7b6a
--- /dev/null
+++ b/part01/.travis.yml
@@ -0,0 +1 @@
+language: crystal
diff --git a/part01/.vscode/tasks.json b/part01/.vscode/tasks.json
new file mode 100644
index 0000000..b46f9a3
--- /dev/null
+++ b/part01/.vscode/tasks.json
@@ -0,0 +1,30 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "taskName": "Crystal spec all",
+            "type": "shell",
+            "command": "sh -c 'cd ${workspaceRoot} && crystal spec'",
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            },
+            "presentation": {
+                "reveal": "always",
+                "panel": "new"
+            }
+        },
+        {
+            "taskName": "Crystal spec current",
+            "type": "shell",
+            "command": "sh -c 'cd ${workspaceRoot} && crystal spec ${relativeFile}:${lineNumber}'",
+            "group": "test",
+            "presentation": {
+                "reveal": "always",
+                "panel": "new"
+            }
+        }
+    ]
+}
\ No newline at end of file
diff --git a/part01/LICENSE b/part01/LICENSE
new file mode 100644
index 0000000..b163f5d
--- /dev/null
+++ b/part01/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017 at-grandpa
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/part01/README.md b/part01/README.md
new file mode 100644
index 0000000..72fcbf6
--- /dev/null
+++ b/part01/README.md
@@ -0,0 +1 @@
+# 第01章 仮実装
\ No newline at end of file
diff --git a/part01/shard.yml b/part01/shard.yml
new file mode 100644
index 0000000..8b17150
--- /dev/null
+++ b/part01/shard.yml
@@ -0,0 +1,13 @@
+name: part01
+version: 0.1.0
+
+authors:
+  - at-grandpa <yoshiyuki.tsuchida.k@gmail.com>
+
+targets:
+  part01:
+    main: src/money.cr
+
+crystal: 0.23.1
+
+license: MIT
diff --git a/part01/spec/money_spec.cr b/part01/spec/money_spec.cr
new file mode 100644
index 0000000..13bae56
--- /dev/null
+++ b/part01/spec/money_spec.cr
@@ -0,0 +1,11 @@
+require "./spec_helper"
+
+describe Money do
+  describe "multiplication" do
+    it "$5 * 2 = 10 になること" do
+      five = Money::Dollar.new(5)
+      five.times(2)
+      five.amount.should eq 10
+    end
+  end
+end
diff --git a/part01/spec/spec_helper.cr b/part01/spec/spec_helper.cr
new file mode 100644
index 0000000..a9a3f1b
--- /dev/null
+++ b/part01/spec/spec_helper.cr
@@ -0,0 +1,2 @@
+require "spec"
+require "../src/money"
diff --git a/part01/src/money.cr b/part01/src/money.cr
new file mode 100644
index 0000000..0f22eed
--- /dev/null
+++ b/part01/src/money.cr
@@ -0,0 +1,4 @@
+require "./money/*"
+
+module Money
+end
diff --git a/part01/src/money/dollar.cr b/part01/src/money/dollar.cr
new file mode 100644
index 0000000..1f5b95a
--- /dev/null
+++ b/part01/src/money/dollar.cr
@@ -0,0 +1,12 @@
+module Money
+  class Dollar
+    property amount : Int32
+
+    def initialize(@amount : Int32)
+    end
+
+    def times(multiplier : Int32)
+      @amount *= multiplier
+    end
+  end
+end