diff --git a/c/unpack.c b/c/unpack.c
index e90a29af..f1b3bb1f 100644
--- a/c/unpack.c
+++ b/c/unpack.c
@@ -337,6 +337,11 @@ msgpack_zone* msgpack_unpacker_release_zone(msgpack_unpacker* mpac)
 	return old;
 }
 
+void msgpack_unpacker_reset_zone(msgpack_unpacker* mpac)
+{
+	msgpack_zone_clear(mpac->z);
+}
+
 bool msgpack_unpacker_flush_zone(msgpack_unpacker* mpac)
 {
 	if(CTX_REFERENCED(mpac)) {
diff --git a/c/unpack.h b/c/unpack.h
index a9caf07b..ef637744 100644
--- a/c/unpack.h
+++ b/c/unpack.h
@@ -58,6 +58,8 @@ msgpack_object msgpack_unpacker_data(msgpack_unpacker* mpac);
 
 msgpack_zone* msgpack_unpacker_release_zone(msgpack_unpacker* mpac);
 
+void msgpack_unpacker_reset_zone(msgpack_unpacker* mpac);
+
 void msgpack_unpacker_reset(msgpack_unpacker* mpac);
 
 static inline size_t msgpack_unpacker_message_size(const msgpack_unpacker* mpac);
diff --git a/c/zone.c b/c/zone.c
index e891c821..7a275f6e 100644
--- a/c/zone.c
+++ b/c/zone.c
@@ -57,9 +57,23 @@ static inline void destroy_chunk_array(msgpack_zone_chunk_array* ca)
 	for(; chunk != ca->tail+1; ++chunk) {
 		free(chunk->alloc);
 	}
+
 	free(ca->array);
 }
 
+static inline void clear_chunk_array(msgpack_zone_chunk_array* ca)
+{
+	msgpack_zone_chunk* chunk = ca->array + 1;
+	for(; chunk != ca->tail+1; ++chunk) {
+		free(chunk->alloc);
+	}
+
+	ca->tail = ca->array;
+
+	ca->array[0].free += ca->array[0].ptr - (char*)ca->array[0].alloc;
+	ca->array[0].ptr   = (char*)ca->array[0].alloc;
+}
+
 void* msgpack_zone_malloc(msgpack_zone* zone, size_t size)
 {
 	msgpack_zone_chunk_array* const ca = &zone->chunk_array;
@@ -124,16 +138,27 @@ static inline void init_finalizer_array(msgpack_zone_finalizer_array* fa)
 	fa->array = NULL;
 }
 
-static inline void destroy_finalizer_array(msgpack_zone_finalizer_array* fa)
+static inline void call_finalizer_array(msgpack_zone_finalizer_array* fa)
 {
 	// 逆順に呼び出し
 	msgpack_zone_finalizer* fin = fa->tail;
 	for(; fin != fa->array; --fin) {
 		(*(fin-1)->func)((fin-1)->data);
 	}
+}
+
+static inline void destroy_finalizer_array(msgpack_zone_finalizer_array* fa)
+{
+	call_finalizer_array(fa);
 	free(fa->array);
 }
 
+static inline void clear_finalizer_array(msgpack_zone_finalizer_array* fa)
+{
+	call_finalizer_array(fa);
+	fa->tail = fa->array;
+}
+
 bool msgpack_zone_push_finalizer(msgpack_zone* zone,
 		void (*func)(void* data), void* data)
 {
@@ -208,6 +233,11 @@ void msgpack_zone_destroy(msgpack_zone* zone)
 	destroy_chunk_array(&zone->chunk_array);
 }
 
+void msgpack_zone_clear(msgpack_zone* zone)
+{
+	clear_finalizer_array(&zone->finalizer_array);
+	clear_chunk_array(&zone->chunk_array);
+}
 
 msgpack_zone* msgpack_zone_new(size_t chunk_size)
 {
diff --git a/c/zone.h b/c/zone.h
index 3dc9f524..3c1188df 100644
--- a/c/zone.h
+++ b/c/zone.h
@@ -72,6 +72,8 @@ bool msgpack_zone_push_finalizer(msgpack_zone* zone,
 
 bool msgpack_zone_is_empty(msgpack_zone* zone);
 
+void msgpack_zone_clear(msgpack_zone* zone);
+
 
 #ifdef __cplusplus
 }
diff --git a/cpp/unpack.hpp b/cpp/unpack.hpp
index 38ac7ac8..324111a5 100644
--- a/cpp/unpack.hpp
+++ b/cpp/unpack.hpp
@@ -64,6 +64,9 @@ public:
 	// otherwise the memrory will leak.
 	zone* release_zone();
 
+	/*! 5.2. this method is equivalence to `delete release_zone()` */
+	void reset_zone();
+
 	/*! 5.3. after release_zone(), re-initialize unpacker */
 	void reset();
 
@@ -217,6 +220,11 @@ inline zone* unpacker::release_zone()
 	return r;
 }
 
+inline void unpacker::reset_zone()
+{
+	msgpack_unpacker_reset_zone(this);
+}
+
 inline void unpacker::reset()
 {
 	msgpack_unpacker_reset(this);
diff --git a/cpp/zone.hpp.erb b/cpp/zone.hpp.erb
index a2536270..930c8e8a 100644
--- a/cpp/zone.hpp.erb
+++ b/cpp/zone.hpp.erb
@@ -37,6 +37,8 @@ public:
 
 	void push_finalizer(void (*func)(void*), void* data);
 
+	void clear();
+
 	<%0.upto(GENERATION_LIMIT) {|i|%>
 	template <typename T<%1.upto(i) {|j|%>, typename A<%=j%><%}%>>
 	T* allocate(<%=(1..i).map{|j|"A#{j} a#{j}"}.join(', ')%>);
@@ -78,6 +80,11 @@ inline void zone::push_finalizer(void (*func)(void*), void* data)
 	}
 }
 
+inline void zone::clear()
+{
+	msgpack_zone_clear(this);
+}
+
 template <typename T>
 void zone::object_destructor(void* obj)
 {