diff --git a/.gitignore b/.gitignore
index 7990289f..eaa61537 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,5 +14,5 @@ tmp/
 *.sqlite3
 *.db
 
-_build/
-
+docs/_build/
+docs/_generated/
diff --git a/README.md b/README.md
index f252e289..60bd5ce8 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ You can install optuna-dashboard via [PyPI](https://pypi.org/project/optuna-dash
 $ pip install optuna-dashboard
 ```
 
-Also you can install following optional dependencies to make optuna-dashboard faster.
+Also, you can install following optional dependencies to make optuna-dashboard faster.
 
 ```console
 $ pip install optuna-fast-fanova gunicorn
diff --git a/docs/_static/css/custom.css b/docs/_static/css/custom.css
new file mode 100644
index 00000000..42bc2d90
--- /dev/null
+++ b/docs/_static/css/custom.css
@@ -0,0 +1,173 @@
+/* Parameter names and colons after them in a signature */
+em.sig-param > span:nth-child(1),
+em.sig-param > span:nth-child(2) {
+  color: #555555;
+}
+
+/* Type hints and default values in a signature */
+em.sig-param > span:not(:nth-child(1)):not(:nth-child(2)) {
+  color: #2980b9;
+}
+
+/* Internal links in a signature */
+.rst-content dl.class > dt a.reference.internal,
+.rst-content dl.method > dt a.reference.internal,
+.rst-content dl.function > dt a.reference.internal {
+  color: #2980b9;
+}
+
+/* External links in a signature */
+.rst-content dl.class > dt a.reference.external,
+.rst-content dl.method > dt a.reference.external,
+.rst-content dl.function > dt a.reference.external {
+  color: #2980b9;
+}
+
+/* Containers for a signature */
+.rst-content dl.class > dt,
+.rst-content dl.function > dt {
+  background-color: #f0f0f0;
+}
+
+/* Containers for methods, properties, parameters, and returns */
+.rst-content dl:not(.docutils) dl dt {
+  border-left: solid 3px #6ab0de;
+}
+
+/* Main content */
+.wy-nav-content {
+  max-width: 1200px;
+}
+
+/* Sidebar header (and topbar for mobile) */
+.wy-side-nav-search,
+.wy-nav-top {
+  background: #f1f3f4;
+}
+.wy-side-nav-search div.version {
+  color: #404040;
+}
+
+.wy-nav-top a {
+  color: #404040;
+}
+
+.wy-nav-top i {
+  color: #404040;
+}
+
+/* Sidebar */
+.wy-nav-side {
+  background: #f1f3f4;
+}
+
+/* A tag */
+.wy-menu-vertical a {
+  color: #707070;
+}
+
+a {
+  color: #2ba9cd;
+}
+
+.wy-menu-vertical a:active {
+  background-color: #2ba9cd;
+  cursor: pointer;
+  color: #f1f3f4;
+}
+
+.highlight {
+  background: #f1f3f4;
+}
+
+.navbar {
+  background: #ffffff;
+}
+
+@media only screen and (max-width: 896px) {
+  .navbar {
+    height: 0;
+  }
+}
+
+.navbar-nav {
+  background: #ffffff;
+  list-style: none;
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  justify-content: flex-end;
+  padding: 20px;
+  max-width: 1200px;
+  margin-left: 300px;
+}
+
+.ml-auto {
+  margin-left: auto !important;
+}
+
+.header_link {
+  margin: 15px 2px;
+  font-size: 16px;
+  font-weight: 600;
+  cursor: pointer;
+  padding: 0.5rem 0.8rem 0.5rem 0.5rem;
+  color: #636a73;
+}
+
+.navbar-nav a:focus,
+a:hover {
+  color: #2ba9cd;
+  text-decoration: none;
+}
+
+.navbar-nav a:visited {
+  color: #636a73;
+  text-decoration: none;
+}
+
+.wy-alert.wy-alert-info .wy-alert-title,
+.rst-content .note .wy-alert-title,
+.rst-content .wy-alert-info.attention .wy-alert-title,
+.rst-content .wy-alert-info.caution .wy-alert-title,
+.rst-content .wy-alert-info.danger .wy-alert-title,
+.rst-content .wy-alert-info.error .wy-alert-title,
+.rst-content .wy-alert-info.hint .wy-alert-title,
+.rst-content .wy-alert-info.important .wy-alert-title,
+.rst-content .wy-alert-info.tip .wy-alert-title,
+.rst-content .wy-alert-info.warning .wy-alert-title,
+.rst-content .seealso .wy-alert-title,
+.rst-content .wy-alert-info.admonition-todo .wy-alert-title,
+.rst-content .wy-alert-info.admonition .wy-alert-title,
+.wy-alert.wy-alert-info .rst-content .admonition-title,
+.rst-content .wy-alert.wy-alert-info .admonition-title,
+.rst-content .note .admonition-title,
+.rst-content .wy-alert-info.attention .admonition-title,
+.rst-content .wy-alert-info.caution .admonition-title,
+.rst-content .wy-alert-info.danger .admonition-title,
+.rst-content .wy-alert-info.error .admonition-title,
+.rst-content .wy-alert-info.hint .admonition-title,
+.rst-content .wy-alert-info.important .admonition-title,
+.rst-content .wy-alert-info.tip .admonition-title,
+.rst-content .wy-alert-info.warning .admonition-title,
+.rst-content .seealso .admonition-title,
+.rst-content .wy-alert-info.admonition-todo .admonition-title,
+.rst-content .wy-alert-info.admonition .admonition-title {
+  background: #2ba9cd;
+}
+
+.wy-alert,
+.rst-content .note,
+.rst-content .attention,
+.rst-content .caution,
+.rst-content .danger,
+.rst-content .error,
+.rst-content .hint,
+.rst-content .important,
+.rst-content .tip,
+.rst-content .warning,
+.rst-content .seealso,
+.rst-content .admonition-todo,
+.rst-content .admonition {
+  background: #f1f3f4;
+}
\ No newline at end of file
diff --git a/docs/_static/favicon.ico b/docs/_static/favicon.ico
new file mode 100644
index 00000000..1e78869f
Binary files /dev/null and b/docs/_static/favicon.ico differ
diff --git a/docs/_static/optuna-logo.png b/docs/_static/optuna-logo.png
new file mode 100644
index 00000000..752d6c80
Binary files /dev/null and b/docs/_static/optuna-logo.png differ
diff --git a/docs/api.rst b/docs/api.rst
new file mode 100644
index 00000000..3d0314b1
--- /dev/null
+++ b/docs/api.rst
@@ -0,0 +1,40 @@
+.. module:: optuna_dashboard
+
+API Reference
+=============
+
+General APIs
+------------
+
+.. autosummary::
+   :toctree: _generated/
+   :nosignatures:
+
+   optuna_dashboard.run_server
+   optuna_dashboard.wsgi
+   optuna_dashboard.set_objective_names
+   optuna_dashboard.save_note
+
+Human-in-the-loop
+-----------------
+
+.. autosummary::
+   :toctree: _generated/
+   :nosignatures:
+
+   optuna_dashboard.register_objective_form_widgets
+   optuna_dashboard.ObjectiveChoiceWidget
+   optuna_dashboard.ObjectiveSliderWidget
+   optuna_dashboard.ObjectiveTextInputWidget
+   optuna_dashboard.ObjectiveUserAttrRef
+
+Artifact
+--------
+
+.. autosummary::
+   :toctree: _generated/
+   :nosignatures:
+
+   optuna_dashboard.artifact.upload_artifact
+   optuna_dashboard.artifact.file_system.FileSystemBackend
+   optuna_dashboard.artifact.boto3.Boto3Backend
diff --git a/docs/conf.py b/docs/conf.py
index 93077d88..45cbf296 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -2,26 +2,45 @@
 #
 # For the full list of built-in configuration values, see the documentation:
 # https://www.sphinx-doc.org/en/master/usage/configuration.html
+import os
+import sys
 
 # -- Project information -----------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
 
-project = 'Optuna Dashboard'
-copyright = '2023, Masashi Shibata'
-author = 'Masashi Shibata'
+project = "Optuna Dashboard"
+copyright = "2023, Optuna Dashboard Contributors"
+author = "Masashi Shibata"
 
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-extensions = []
+SOURCE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__name__)))
+sys.path.insert(0, SOURCE_DIR)
 
-templates_path = ['_templates']
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+extensions = [
+    "sphinx.ext.autodoc",
+    "sphinx.ext.doctest",
+    "sphinx.ext.autosummary",
+]
 
+templates_path = ["_templates"]
+exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
+autosummary_generate = True
+autodoc_typehints = "description"
+autodoc_default_options = {
+    "members": True,
+    "inherited-members": True,
+    "exclude-members": "with_traceback",
+}
 
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-html_theme = 'alabaster'
-html_static_path = ['_static']
+html_theme = "sphinx_rtd_theme"
+html_theme_options = {"logo_only": True, "navigation_with_keys": True}
+html_static_path = ["_static"]
+html_favicon = "_static/favicon.ico"
+html_logo = "_static/optuna-logo.png"
+html_css_files = ["css/custom.css"]
diff --git a/docs/index.rst b/docs/index.rst
index c8a1d330..996621bc 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -3,15 +3,25 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
-Welcome to Optuna Dashboard's documentation!
-============================================
+Optuna Dashboard
+================
+
+Real-time dashboard for `Optuna <https://github.com/optuna/optuna>`_.
 
 .. toctree::
-   :maxdepth: 2
+   :maxdepth: 3
    :caption: Contents:
 
+   installation
+   api
 
 
+Links
+=====
+
+* `Github <https://github.com/optuna/optuna-dashboard>`_
+* `PyPI <https://pypi.python.org/pypi/optuna-dashboard>`_
+
 Indices and tables
 ==================
 
diff --git a/docs/installation.rst b/docs/installation.rst
new file mode 100644
index 00000000..c8fb2ac1
--- /dev/null
+++ b/docs/installation.rst
@@ -0,0 +1,17 @@
+Installation
+============
+
+Optuna Dashboard supports Python 3.7 or newer.
+
+We recommend to install Optuna via pip:
+You can install optuna-dashboard via `PyPI <https://pypi.org/project/optuna-dashboard/>`_ or `Anaconda Cloud <https://anaconda.org/conda-forge/optuna-dashboard>`_.
+
+.. code-block:: console
+
+    $ pip install optuna-dashboard
+
+Also, you can install following optional dependencies to make optuna-dashboard faster.
+
+.. code-block:: console
+
+   $ pip install optuna-fast-fanova gunicorn
diff --git a/requirements.txt b/requirements.txt
index 57ecdd36..25c37877 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,3 +17,7 @@ moto[s3]
 
 # visual regression tests
 pyppeteer
+
+# docs
+sphinx
+sphinx_rtd_theme