diff --git a/fuzz/README.rst b/fuzz/README.rst
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--- /dev/null
+++ b/fuzz/README.rst
@@ -0,0 +1,33 @@
+Fuzzer
+======
+
+This directory contains fuzzer target mainly written to integrate
+nghttp2 into `oss-fuzz <https://github.com/google/oss-fuzz>`_.
+
+fuzz_target.cc contains an entry point of fuzzer.  corpus directory
+contains initial data for fuzzer.
+
+The file name of initial data under corpus is the lower-cased hex
+string of SHA-256 hash of its own content.
+
+corpus/h2spec contains input data which was recorded when we ran
+`h2spec <https://github.com/summerwind/h2spec>`_ against nghttpd.
+
+corpus/nghttp contains input data which was recorded when we ran
+nghttp against nghttpd with some varying command line options of
+nghttp.
+
+
+To build fuzz_target.cc, make sure that libnghttp2 is built with
+following compiler/linker flags:
+
+.. code-block:: text
+
+    CPPFLAGS="-fsanitize-coverage=edge -fsanitize=addres"
+    LDFLAGS="-fsanitize-coverage=edge -fsanitize=addres"
+
+Then, fuzz_target.cc can be built using the following command:
+
+.. code-block:: text
+
+    $ clang++ -fsanitize-coverage=edge -fsanitize=address -I../lib/includes -std=c++11 fuzz_target.cc ../lib/.libs/libnghttp2.a  /usr/lib/llvm-3.9/lib/libFuzzer.a -o nghttp2_fuzzer
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diff --git a/fuzz/corpus/h2spec/0b39d9df6e1721030667980a41547272ad42377149edcf130b2bf0b76804c61f b/fuzz/corpus/h2spec/0b39d9df6e1721030667980a41547272ad42377149edcf130b2bf0b76804c61f
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--- /dev/null
+++ b/fuzz/corpus/h2spec/0b39d9df6e1721030667980a41547272ad42377149edcf130b2bf0b76804c61f
@@ -0,0 +1,2 @@
+INVALID CONNECTION PREFACE
+
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diff --git a/fuzz/fuzz_target.cc b/fuzz/fuzz_target.cc
new file mode 100644
index 00000000..4adc5ed6
--- /dev/null
+++ b/fuzz/fuzz_target.cc
@@ -0,0 +1,79 @@
+#include <nghttp2/nghttp2.h>
+
+namespace {
+int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
+                           void *user_data) {
+  return 0;
+}
+} // namespace
+
+namespace {
+int on_begin_headers_callback(nghttp2_session *session,
+                              const nghttp2_frame *frame, void *user_data) {
+  return 0;
+}
+} // namespace
+
+namespace {
+int on_header_callback2(nghttp2_session *session, const nghttp2_frame *frame,
+                        nghttp2_rcbuf *name, nghttp2_rcbuf *value,
+                        uint8_t flags, void *user_data) {
+  return 0;
+}
+} // namespace
+
+namespace {
+int before_frame_send_callback(nghttp2_session *session,
+                               const nghttp2_frame *frame, void *user_data) {
+  return 0;
+}
+} // namespace
+
+namespace {
+int on_frame_send_callback(nghttp2_session *session, const nghttp2_frame *frame,
+                           void *user_data) {
+  return 0;
+}
+} // namespace
+
+namespace {
+void send_pending(nghttp2_session *session) {
+  for (;;) {
+    const uint8_t *data;
+    auto n = nghttp2_session_mem_send(session, &data);
+    if (n == 0) {
+      return;
+    }
+  }
+}
+} // namespace
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  nghttp2_session *session;
+  nghttp2_session_callbacks *callbacks;
+
+  nghttp2_session_callbacks_new(&callbacks);
+  nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
+                                                       on_frame_recv_callback);
+  nghttp2_session_callbacks_set_on_begin_headers_callback(
+      callbacks, on_begin_headers_callback);
+  nghttp2_session_callbacks_set_on_header_callback2(callbacks,
+                                                    on_header_callback2);
+  nghttp2_session_callbacks_set_before_frame_send_callback(
+      callbacks, before_frame_send_callback);
+  nghttp2_session_callbacks_set_on_frame_send_callback(callbacks,
+                                                       on_frame_send_callback);
+
+  nghttp2_session_server_new(&session, callbacks, nullptr);
+  nghttp2_session_callbacks_del(callbacks);
+
+  nghttp2_settings_entry iv{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100};
+  nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);
+  send_pending(session);
+  nghttp2_session_mem_recv(session, data, size);
+  send_pending(session);
+
+  nghttp2_session_del(session);
+
+  return 0;
+}