diff --git a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
index 51d2ba108..45d24fcaf 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
@@ -462,7 +462,7 @@ namespace UniVRM10
                                 Cone = new UniGLTF.Extensions.VRMC_springBone_limit.ConeLimit
                                 {
                                     Rotation = ReverseX(y.m_limitSpaceOffset),
-                                    Angle = y.m_theta,
+                                    Angle = y.m_phi,
                                 }
                             }
                         };
@@ -480,7 +480,7 @@ namespace UniVRM10
                                 Hinge = new UniGLTF.Extensions.VRMC_springBone_limit.HingeLimit
                                 {
                                     Rotation = ReverseX(y.m_limitSpaceOffset),
-                                    Angle = y.m_theta,
+                                    Angle = y.m_phi,
                                 }
                             }
                         };
@@ -499,7 +499,7 @@ namespace UniVRM10
                                 {
                                     Rotation = ReverseX(y.m_limitSpaceOffset),
                                     Theta = y.m_theta,
-                                    Phi = y.m_theta,
+                                    Phi = y.m_phi,
                                 }
                             }
                         };
diff --git a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
index 2f4c25cf3..df3157be9 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
@@ -636,20 +636,20 @@ namespace UniVRM10
                                 {
                                     joint.m_anglelimitType = UniGLTF.SpringBoneJobs.AnglelimitTypes.Cone;
                                     joint.m_limitSpaceOffset = QuaternionFromFloat4(cone.Rotation);
-                                    joint.m_theta = cone.Angle.GetValueOrDefault(Mathf.PI * 0.5f);
+                                    joint.m_phi = cone.Angle.GetValueOrDefault(Mathf.PI * 0.5f);
                                 }
                                 else if (extensionSpringBoneLimit.Limit.Hinge is UniGLTF.Extensions.VRMC_springBone_limit.HingeLimit hinge)
                                 {
                                     joint.m_anglelimitType = UniGLTF.SpringBoneJobs.AnglelimitTypes.Hinge;
                                     joint.m_limitSpaceOffset = QuaternionFromFloat4(hinge.Rotation);
-                                    joint.m_theta = hinge.Angle.GetValueOrDefault(Mathf.PI * 0.5f);
+                                    joint.m_phi = hinge.Angle.GetValueOrDefault(Mathf.PI * 0.5f);
                                 }
                                 else if (extensionSpringBoneLimit.Limit.Spherical is UniGLTF.Extensions.VRMC_springBone_limit.SphericalLimit spherical)
                                 {
                                     joint.m_anglelimitType = UniGLTF.SpringBoneJobs.AnglelimitTypes.Spherical;
                                     joint.m_limitSpaceOffset = QuaternionFromFloat4(spherical.Rotation);
+                                    joint.m_phi = spherical.Phi.GetValueOrDefault(Mathf.PI * 0.5f);
                                     joint.m_theta = spherical.Theta.GetValueOrDefault(Mathf.PI * 0.5f);
-                                    joint.m_theta = spherical.Phi.GetValueOrDefault(Mathf.PI * 0.5f);
                                 }
                             }