diff --git a/test/ecdsa_c_test.cpp b/test/ecdsa_c_test.cpp
index d3b360f..e0af381 100644
--- a/test/ecdsa_c_test.cpp
+++ b/test/ecdsa_c_test.cpp
@@ -2,6 +2,18 @@
 #include <cybozu/test.hpp>
 #include <string.h>
 
+template<class T, class Serializer, class Deserializer>
+void serializeTest(const T& x, const Serializer& serialize, const Deserializer& deserialize)
+{
+	char buf[128];
+	size_t n = serialize(buf, sizeof(buf), &x);
+	CYBOZU_TEST_ASSERT(n > 0);
+	T y;
+	size_t m = deserialize(&y, buf, n);
+	CYBOZU_TEST_EQUAL(m, n);
+	CYBOZU_TEST_ASSERT(memcmp(&x, &y, n) == 0);
+}
+
 CYBOZU_TEST_AUTO(ecdsa)
 {
 	int ret;
@@ -16,9 +28,12 @@ CYBOZU_TEST_AUTO(ecdsa)
 
 	ret = ecdsaSecretKeySetByCSPRNG(&sec);
 	CYBOZU_TEST_EQUAL(ret, 0);
+	serializeTest(sec, ecdsaSecretKeySerialize, ecdsaSecretKeyDeserialize);
 
 	ecdsaGetPublicKey(&pub, &sec);
+	serializeTest(pub, ecdsaPublicKeySerialize, ecdsaPublicKeyDeserialize);
 	ecdsaSign(&sig, &sec, msg, msgSize);
+	serializeTest(sig, ecdsaSignatureSerialize, ecdsaSignatureDeserialize);
 	CYBOZU_TEST_ASSERT(ecdsaVerify(&sig, &pub, msg, msgSize));
 
 	ppub = ecdsaPrecomputedPublicKeyCreate();