diff --git a/pemparser/consts.go b/pemparser/consts.go
index 73ebbbc..2e63bb5 100644
--- a/pemparser/consts.go
+++ b/pemparser/consts.go
@@ -1,8 +1,9 @@
 package pemparser
 
 const (
-	RSAPrivateKeyPemType = "RSA PRIVATE KEY"
-	ECPrivateKeyPemType  = "EC PRIVATE KEY"
-	CertificatePemType   = "CERTIFICATE"
-	PublicKeyPemType     = "PUBLIC KEY"
+	RSAPrivateKeyPemType      = "RSA PRIVATE KEY"
+	ECPrivateKeyPemType       = "EC PRIVATE KEY"
+	CertificatePemType        = "CERTIFICATE"
+	CertificateRequestPemType = "CERTIFICATE REQUEST"
+	PublicKeyPemType          = "PUBLIC KEY"
 )
diff --git a/pemparser/parser.go b/pemparser/parser.go
index a3bfb64..8c42b55 100644
--- a/pemparser/parser.go
+++ b/pemparser/parser.go
@@ -23,6 +23,25 @@ func ForeachPemBlock(pemText []byte, f func(*pem.Block) error) error {
 	return nil
 }
 
+var ErrMultipleCertificateRequestBlocks = errors.New("Found more than one CERTIFICATE REQUEST block")
+
+func ParseCertificateRequest(pemText []byte) (req *x509.CertificateRequest, err error) {
+	ForeachPemBlock(pemText, func(block *pem.Block) error {
+		if block.Type != CertificateRequestPemType {
+			return nil
+		}
+
+		if req != nil {
+			err = ErrMultipleCertificateRequestBlocks
+			return err
+		}
+
+		req, err = x509.ParseCertificateRequest(block.Bytes)
+		return err
+	})
+	return
+}
+
 func ParseCertificates(pemText []byte) ([]*x509.Certificate, error) {
 	var certs []*x509.Certificate
 
diff --git a/pemparser/parser_test.go b/pemparser/parser_test.go
new file mode 100644
index 0000000..72feb33
--- /dev/null
+++ b/pemparser/parser_test.go
@@ -0,0 +1,42 @@
+package pemparser_test
+
+import (
+	"testing"
+
+	"github.com/IPA-CyberLab/kmgm/pemparser"
+)
+
+const TestCSR = `-----BEGIN CERTIFICATE REQUEST-----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=
+-----END CERTIFICATE REQUEST-----
+`
+
+func Test_ParseCertificateRequest(t *testing.T) {
+	req, err := pemparser.ParseCertificateRequest([]byte(TestCSR))
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	if req.Subject.CommonName != "hogefuga" {
+		t.Errorf("Unexpected CN: %s", req.Subject.CommonName)
+	}
+
+	multipleCSRs := append([]byte(TestCSR), []byte(TestCSR)...)
+	req, err = pemparser.ParseCertificateRequest(multipleCSRs)
+	if err != pemparser.ErrMultipleCertificateRequestBlocks {
+		t.Errorf("Unexpected error: %v", err)
+	}
+}