diff --git a/Files.cmake b/Files.cmake
index d3a204fb..91b58ee2 100644
--- a/Files.cmake
+++ b/Files.cmake
@@ -231,6 +231,7 @@ IF (MSGPACK_ENABLE_CXX)
         include/msgpack/adaptor/vector_bool.hpp
         include/msgpack/adaptor/vector_char.hpp
         include/msgpack/adaptor/vector_unsigned_char.hpp
+        include/msgpack/adaptor/wstring.hpp
         include/msgpack/cpp_config.hpp
         include/msgpack/cpp_config_decl.hpp
         include/msgpack/create_object_visitor.hpp
@@ -605,6 +606,7 @@ IF (MSGPACK_ENABLE_CXX)
         include/msgpack/v1/adaptor/vector_bool.hpp
         include/msgpack/v1/adaptor/vector_char.hpp
         include/msgpack/v1/adaptor/vector_unsigned_char.hpp
+        include/msgpack/v1/adaptor/wstring.hpp
         include/msgpack/v1/cpp_config.hpp
         include/msgpack/v1/cpp_config_decl.hpp
         include/msgpack/v1/detail/cpp03_zone.hpp
diff --git a/include/msgpack/adaptor/wstring.hpp b/include/msgpack/adaptor/wstring.hpp
new file mode 100644
index 00000000..52b59d52
--- /dev/null
+++ b/include/msgpack/adaptor/wstring.hpp
@@ -0,0 +1,15 @@
+//
+// MessagePack for C++ static resolution routine
+//
+// Copyright (C) 2018 KONDO Takatoshi
+//
+//    Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//    http://www.boost.org/LICENSE_1_0.txt)
+//
+#ifndef MSGPACK_TYPE_WSTRING_HPP
+#define MSGPACK_TYPE_WSTRING_HPP
+
+#include "msgpack/v1/adaptor/wstring.hpp"
+
+#endif // MSGPACK_TYPE_WSTRING_HPP
diff --git a/include/msgpack/type.hpp b/include/msgpack/type.hpp
index 1a866c56..b98e7826 100644
--- a/include/msgpack/type.hpp
+++ b/include/msgpack/type.hpp
@@ -21,6 +21,7 @@
 #include "adaptor/vector_bool.hpp"
 #include "adaptor/vector_char.hpp"
 #include "adaptor/vector_unsigned_char.hpp"
+#include "adaptor/wstring.hpp"
 #include "adaptor/msgpack_tuple.hpp"
 #include "adaptor/define.hpp"
 
diff --git a/include/msgpack/v1/adaptor/int.hpp b/include/msgpack/v1/adaptor/int.hpp
index 962e66ff..4d6e83ae 100644
--- a/include/msgpack/v1/adaptor/int.hpp
+++ b/include/msgpack/v1/adaptor/int.hpp
@@ -64,10 +64,9 @@ inline T convert_integer(msgpack::object const& o)
 }
 
 template <>
-struct object_char_sign<true> {
+struct object_sign<true> {
     template <typename T>
-    static typename msgpack::enable_if<msgpack::is_same<T, char>::value>::type
-    make(msgpack::object& o, T v) {
+    static void make(msgpack::object& o, T v) {
         if (v < 0) {
             o.type = msgpack::type::NEGATIVE_INTEGER;
             o.via.i64 = v;
@@ -80,15 +79,17 @@ struct object_char_sign<true> {
 };
 
 template <>
-struct object_char_sign<false> {
-    static void make(msgpack::object& o, char v) {
+struct object_sign<false> {
+    template <typename T>
+    static void make(msgpack::object& o, T v) {
         o.type = msgpack::type::POSITIVE_INTEGER;
         o.via.u64 = v;
     }
 };
 
-inline void object_char(msgpack::object& o, char v) {
-    return object_char_sign<is_signed<char>::value>::make(o, v);
+template <typename T>
+inline void object_char(msgpack::object& o, T v) {
+    return object_sign<is_signed<T>::value>::make(o, v);
 }
 
 }  // namespace detail
@@ -102,6 +103,12 @@ struct convert<char> {
     { v = type::detail::convert_integer<char>(o); return o; }
 };
 
+template <>
+struct convert<wchar_t> {
+    msgpack::object const& operator()(msgpack::object const& o, wchar_t& v) const
+    { v = type::detail::convert_integer<wchar_t>(o); return o; }
+};
+
 template <>
 struct convert<signed char> {
     msgpack::object const& operator()(msgpack::object const& o, signed char& v) const
@@ -171,6 +178,13 @@ struct pack<char> {
     { o.pack_char(v); return o; }
 };
 
+template <>
+struct pack<wchar_t> {
+    template <typename Stream>
+    msgpack::packer<Stream>& operator()(msgpack::packer<Stream>& o, wchar_t v) const
+    { o.pack_wchar(v); return o; }
+};
+
 template <>
 struct pack<signed char> {
     template <typename Stream>
@@ -249,6 +263,12 @@ struct object<char> {
     { type::detail::object_char(o, v); }
 };
 
+template <>
+struct object<wchar_t> {
+    void operator()(msgpack::object& o, wchar_t v) const
+    { type::detail::object_char(o, v); }
+};
+
 template <>
 struct object<signed char> {
     void operator()(msgpack::object& o, signed char v) const {
@@ -367,6 +387,13 @@ struct object_with_zone<char> {
     }
 };
 
+template <>
+struct object_with_zone<wchar_t> {
+    void operator()(msgpack::object::with_zone& o, wchar_t v) const {
+        static_cast<msgpack::object&>(o) << v;
+    }
+};
+
 template <>
 struct object_with_zone<signed char> {
     void operator()(msgpack::object::with_zone& o, signed char v) const {
diff --git a/include/msgpack/v1/adaptor/int_decl.hpp b/include/msgpack/v1/adaptor/int_decl.hpp
index eb596c7a..75f1c7bf 100644
--- a/include/msgpack/v1/adaptor/int_decl.hpp
+++ b/include/msgpack/v1/adaptor/int_decl.hpp
@@ -33,9 +33,10 @@ template <typename T>
 T convert_integer(msgpack::object const& o);
 
 template <bool Signed>
-struct object_char_sign;
+struct object_sign;
 
-void object_char(msgpack::object& o, char v);
+template <typename T>
+void object_char(msgpack::object& o, T v);
 
 }  // namespace detail
 }  // namespace type
diff --git a/include/msgpack/v1/adaptor/wstring.hpp b/include/msgpack/v1/adaptor/wstring.hpp
new file mode 100644
index 00000000..66f7929e
--- /dev/null
+++ b/include/msgpack/v1/adaptor/wstring.hpp
@@ -0,0 +1,121 @@
+//
+// MessagePack for C++ static resolution routine
+//
+// Copyright (C) 2018 KONDO Takatoshi
+//
+//    Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//    http://www.boost.org/LICENSE_1_0.txt)
+//
+#ifndef MSGPACK_V1_TYPE_WSTRING_HPP
+#define MSGPACK_V1_TYPE_WSTRING_HPP
+
+#include "msgpack/versioning.hpp"
+#include "msgpack/adaptor/adaptor_base.hpp"
+#include "msgpack/adaptor/check_container_size.hpp"
+
+#include <vector>
+
+namespace msgpack {
+
+/// @cond
+MSGPACK_API_VERSION_NAMESPACE(v1) {
+/// @endcond
+
+namespace adaptor {
+
+#if !defined(MSGPACK_USE_CPP03)
+
+template <>
+struct as<std::wstring> {
+    std::wstring operator()(const msgpack::object& o) const {
+        if (o.type != msgpack::type::ARRAY) { throw msgpack::type_error(); }
+        std::wstring v;
+        v.reserve(o.via.array.size);
+        if (o.via.array.size > 0) {
+            msgpack::object* p = o.via.array.ptr;
+            msgpack::object* const pend = o.via.array.ptr + o.via.array.size;
+            do {
+                v.push_back(p->as<wchar_t>());
+                ++p;
+            } while (p < pend);
+        }
+        return v;
+    }
+};
+
+#endif // !defined(MSGPACK_USE_CPP03)
+
+template <>
+struct convert<std::wstring> {
+    msgpack::object const& operator()(msgpack::object const& o, std::wstring& v) const {
+        if (o.type != msgpack::type::ARRAY) { throw msgpack::type_error(); }
+        v.resize(o.via.array.size);
+        if (o.via.array.size > 0) {
+            msgpack::object* p = o.via.array.ptr;
+            msgpack::object* const pend = o.via.array.ptr + o.via.array.size;
+            std::wstring::iterator it = v.begin();
+            do {
+                p->convert(*it);
+                ++p;
+                ++it;
+            } while(p < pend);
+        }
+        return o;
+    }
+};
+
+template <>
+struct pack<std::wstring> {
+    template <typename Stream>
+    msgpack::packer<Stream>& operator()(msgpack::packer<Stream>& o, const std::wstring& v) const {
+        uint32_t size = checked_get_container_size(v.size());
+        o.pack_array(size);
+        for (std::wstring::const_iterator it(v.begin()), it_end(v.end());
+            it != it_end; ++it) {
+            o.pack(*it);
+        }
+        return o;
+    }
+};
+
+template <>
+struct object_with_zone<std::wstring> {
+    void operator()(msgpack::object::with_zone& o, const std::wstring& v) const {
+        o.type = msgpack::type::ARRAY;
+        if (v.empty()) {
+            o.via.array.ptr = MSGPACK_NULLPTR;
+            o.via.array.size = 0;
+        }
+        else {
+            uint32_t size = checked_get_container_size(v.size());
+            msgpack::object* p = static_cast<msgpack::object*>(o.zone.allocate_align(sizeof(msgpack::object)*size, MSGPACK_ZONE_ALIGNOF(msgpack::object)));
+            msgpack::object* const pend = p + size;
+            o.via.array.ptr = p;
+            o.via.array.size = size;
+            std::wstring::const_iterator it(v.begin());
+            do {
+#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif // (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) && !defined(__clang__)
+                *p = msgpack::object(*it, o.zone);
+#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif // (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) && !defined(__clang__)
+                ++p;
+                ++it;
+            } while(p < pend);
+        }
+    }
+};
+
+} // namespace adaptor
+
+/// @cond
+} // MSGPACK_API_VERSION_NAMESPACE(v1)
+/// @endcond
+
+} // namespace msgpack
+
+#endif // MSGPACK_V1_TYPE_WSTRING_HPP
diff --git a/include/msgpack/v1/pack.hpp b/include/msgpack/v1/pack.hpp
index 109334cf..26e271ce 100644
--- a/include/msgpack/v1/pack.hpp
+++ b/include/msgpack/v1/pack.hpp
@@ -271,6 +271,20 @@ public:
      */
     packer<Stream>& pack_char(char d);
 
+    /// Packing wchar_t
+    /**
+     * The byte size of the packed data depends on `d`.
+     * If `d` is zero or positive, the packed type is positive fixnum, or uint*,
+     * else the packed type is negative fixnum, or int*
+     * The minimum byte size expression is used.
+     * See https://github.com/msgpack/msgpack/blob/master/spec.md#formats-int
+     *
+     * @param d a packing object.
+     *
+     * @return The reference of `*this`.
+     */
+    packer<Stream>& pack_wchar(wchar_t d);
+
     /// Packing signed char
     /**
      * The byte size of the packed data depends on `d`.
@@ -820,6 +834,18 @@ inline packer<Stream>& packer<Stream>::pack_char(char d)
     return *this;
 }
 
+template <typename Stream>
+inline packer<Stream>& packer<Stream>::pack_wchar(wchar_t d)
+{
+    if (d < 0) {
+        pack_imp_int64(static_cast<int64_t>(d));
+    }
+    else {
+        pack_imp_uint64(static_cast<uint64_t>(d));
+    }
+    return *this;
+}
+
 template <typename Stream>
 inline packer<Stream>& packer<Stream>::pack_signed_char(signed char d)
 {
diff --git a/include/msgpack/v2/adaptor/int_decl.hpp b/include/msgpack/v2/adaptor/int_decl.hpp
index 8ad7206e..9b19f3b7 100644
--- a/include/msgpack/v2/adaptor/int_decl.hpp
+++ b/include/msgpack/v2/adaptor/int_decl.hpp
@@ -30,7 +30,7 @@ struct is_signed;
 
 
 template <bool Signed>
-struct object_char_sign;
+struct object_sign;
 
 //using v1::type::detail::convert_integer_sign;
 
diff --git a/include/msgpack/v3/adaptor/int_decl.hpp b/include/msgpack/v3/adaptor/int_decl.hpp
index 3a3438ce..70600ec1 100644
--- a/include/msgpack/v3/adaptor/int_decl.hpp
+++ b/include/msgpack/v3/adaptor/int_decl.hpp
@@ -30,7 +30,7 @@ struct is_signed;
 
 
 template <bool Signed>
-struct object_char_sign;
+struct object_sign;
 
 //using v2::type::detail::convert_integer_sign;
 
diff --git a/test/msgpack_basic.cpp b/test/msgpack_basic.cpp
index c191a03c..7271e2cd 100644
--- a/test/msgpack_basic.cpp
+++ b/test/msgpack_basic.cpp
@@ -614,3 +614,22 @@ TEST(MSGPACK_STL, simple_buffer_non_const_cstring)
         EXPECT_EQ(val1, val2);
     }
 }
+
+TEST(MSGPACK_STL, simple_buffer_wstring)
+{
+    for (unsigned int k = 0; k < kLoop; k++) {
+        wstring val1;
+        for (unsigned int i = 0; i < kElements; i++)
+            val1 += L'a' + rand() % 26;
+        msgpack::sbuffer sbuf;
+        msgpack::pack(sbuf, val1);
+        msgpack::object_handle oh =
+            msgpack::unpack(sbuf.data(), sbuf.size());
+        EXPECT_EQ(oh.get().type, msgpack::type::ARRAY);
+        wstring val2 = oh.get().as<wstring>();
+        EXPECT_EQ(val1, val2);
+        wstring val3;
+        oh.get().convert(val3);
+        EXPECT_EQ(val1, val3);
+    }
+}
diff --git a/test/object_with_zone.cpp b/test/object_with_zone.cpp
index 95c7845d..f23281c9 100644
--- a/test/object_with_zone.cpp
+++ b/test/object_with_zone.cpp
@@ -332,6 +332,17 @@ TEST(object_without_zone, string)
 
 #endif // MSGPACK_DEFAULT_API_VERSION == 1
 
+// wstring
+TEST(object_with_zone, wstring)
+{
+    wstring v = L"abc";
+    msgpack::zone z;
+    msgpack::object obj(v, z);
+    EXPECT_EQ(obj.as<wstring>(), v);
+    v[0] = 'd';
+    EXPECT_EQ(obj.as<wstring>()[0], L'a');
+}
+
 // char*
 TEST(object_with_zone, char_ptr)
 {