diff --git a/README.md b/README.md
index 498759d8..8d9a41d9 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ to:
 * German
 * Indonesian
 * Italian
+* Japanese
 * Korean
 * Persian
 * Portuguese Brazilian
diff --git a/src/humanize/locale/ja_JP/LC_MESSAGES/humanize.mo b/src/humanize/locale/ja_JP/LC_MESSAGES/humanize.mo
new file mode 100644
index 00000000..7f14155f
Binary files /dev/null and b/src/humanize/locale/ja_JP/LC_MESSAGES/humanize.mo differ
diff --git a/src/humanize/locale/ja_JP/LC_MESSAGES/humanize.po b/src/humanize/locale/ja_JP/LC_MESSAGES/humanize.po
new file mode 100644
index 00000000..68f128d3
--- /dev/null
+++ b/src/humanize/locale/ja_JP/LC_MESSAGES/humanize.po
@@ -0,0 +1,275 @@
+# Japanese (Japan) translations for humanize.
+# Copyright (C) 2018
+# This file is distributed under the same license as the humanize project.
+# @qoolloop, 2018.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: humanize\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2018-01-22 10:48+0900\n"
+"PO-Revision-Date: 2018-01-22 11:11+0900\n"
+"Last-Translator: Kan Torii <oss@qoolloop.com>\n"
+"Language-Team: Japanese\n"
+"Language: ja\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=0;\n"
+"Generated-By: Babel 0.9.6\n"
+"X-Generator: Poedit 2.0.6\n"
+
+#: humanize/number.py:20
+msgctxt "0"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:21
+msgctxt "1"
+msgid "st"
+msgstr "番目"
+
+#: humanize/number.py:22
+msgctxt "2"
+msgid "nd"
+msgstr "番目"
+
+#: humanize/number.py:23
+msgctxt "3"
+msgid "rd"
+msgstr "番目"
+
+#: humanize/number.py:24
+msgctxt "4"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:25
+msgctxt "5"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:26
+msgctxt "6"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:27
+msgctxt "7"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:28
+msgctxt "8"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:29
+msgctxt "9"
+msgid "th"
+msgstr "番目"
+
+#: humanize/number.py:55
+msgid "million"
+msgstr "百万"
+
+#: humanize/number.py:55
+#, fuzzy
+msgid "billion"
+msgstr "十億"
+
+#: humanize/number.py:55
+msgid "trillion"
+msgstr "兆"
+
+#: humanize/number.py:55
+#, fuzzy
+msgid "quadrillion"
+msgstr "千兆"
+
+#: humanize/number.py:56
+#, fuzzy
+msgid "quintillion"
+msgstr "百京"
+
+#: humanize/number.py:56
+#, fuzzy
+msgid "sextillion"
+msgstr "十垓"
+
+#: humanize/number.py:56
+#, fuzzy
+msgid "septillion"
+msgstr "じょ"
+
+#: humanize/number.py:57
+#, fuzzy
+msgid "octillion"
+msgstr "千じょ"
+
+#: humanize/number.py:57
+#, fuzzy
+msgid "nonillion"
+msgstr "百穣"
+
+#: humanize/number.py:57
+#, fuzzy
+msgid "decillion"
+msgstr "十溝"
+
+#: humanize/number.py:57
+#, fuzzy
+msgid "googol"
+msgstr "溝無量大数"
+
+#: humanize/number.py:91
+msgid "one"
+msgstr "一"
+
+#: humanize/number.py:91
+msgid "two"
+msgstr "二"
+
+#: humanize/number.py:91
+msgid "three"
+msgstr "三"
+
+#: humanize/number.py:91
+msgid "four"
+msgstr "四"
+
+#: humanize/number.py:91
+msgid "five"
+msgstr "五"
+
+#: humanize/number.py:91
+msgid "six"
+msgstr "六"
+
+#: humanize/number.py:92
+msgid "seven"
+msgstr "七"
+
+#: humanize/number.py:92
+msgid "eight"
+msgstr "八"
+
+#: humanize/number.py:92
+msgid "nine"
+msgstr "九"
+
+#: humanize/time.py:64 humanize/time.py:126
+#, fuzzy
+msgid "a moment"
+msgstr "短時間"
+
+#: humanize/time.py:66
+msgid "a second"
+msgstr "1秒"
+
+#: humanize/time.py:68
+#, python-format
+msgid "%d second"
+msgid_plural "%d seconds"
+msgstr[0] "%d秒"
+msgstr[1] "%d秒"
+
+#: humanize/time.py:70
+msgid "a minute"
+msgstr "1分"
+
+#: humanize/time.py:73
+#, python-format
+msgid "%d minute"
+msgid_plural "%d minutes"
+msgstr[0] "%d分"
+msgstr[1] "%d分"
+
+#: humanize/time.py:75
+msgid "an hour"
+msgstr "1時間"
+
+#: humanize/time.py:78
+#, python-format
+msgid "%d hour"
+msgid_plural "%d hours"
+msgstr[0] "%d時間"
+msgstr[1] "%d時間"
+
+#: humanize/time.py:81
+msgid "a day"
+msgstr "1日"
+
+#: humanize/time.py:83 humanize/time.py:86
+#, python-format
+msgid "%d day"
+msgid_plural "%d days"
+msgstr[0] "%d日"
+msgstr[1] "%d日"
+
+#: humanize/time.py:88
+msgid "a month"
+msgstr "1ヶ月"
+
+#: humanize/time.py:90
+#, python-format
+msgid "%d month"
+msgid_plural "%d months"
+msgstr[0] "%dヶ月"
+msgstr[1] "%dヶ月"
+
+#: humanize/time.py:93
+msgid "a year"
+msgstr "1年"
+
+#: humanize/time.py:95 humanize/time.py:103
+#, python-format
+msgid "1 year, %d day"
+msgid_plural "1 year, %d days"
+msgstr[0] "1年 %d日"
+msgstr[1] "1年 %d日"
+
+#: humanize/time.py:98
+msgid "1 year, 1 month"
+msgstr "1年 1ヶ月"
+
+#: humanize/time.py:100
+#, python-format
+msgid "1 year, %d month"
+msgid_plural "1 year, %d months"
+msgstr[0] "1年 %dヶ月"
+msgstr[1] "1年 %dヶ月"
+
+#: humanize/time.py:105
+#, python-format
+msgid "%d year"
+msgid_plural "%d years"
+msgstr[0] "%d年"
+msgstr[1] "%d年"
+
+#: humanize/time.py:123
+#, python-format
+msgid "%s from now"
+msgstr "%s後"
+
+#: humanize/time.py:123
+#, python-format
+msgid "%s ago"
+msgstr "%s前"
+
+#: humanize/time.py:127
+#, fuzzy
+msgid "now"
+msgstr "今"
+
+#: humanize/time.py:145
+msgid "today"
+msgstr "本日"
+
+#: humanize/time.py:147
+msgid "tomorrow"
+msgstr "明日"
+
+#: humanize/time.py:149
+msgid "yesterday"
+msgstr "昨日"