An electrically operated valve comprising: a valve body ; a driver configured to move the valve body along a first axis (Z); a rotation shaft configured to rotate the driver around the first axis; characterized in that the electrically operated valve further comprises: an angle sensor ; a permanent magnet member disposed on the rotation shaft and configured to rotate with the rotation shaft ; wherein the angle sensor is disposed above a permanent magnet included in the permanent magnet member and configured to detect a rotation angle of the permanent magnet ; wherein the electrically operated valve further comprises a yoke configured to cover a portion of the permanent magnet and optionally a portion of the angle sensor ; and a case configured to contain the permanent magnet member , wherein an end wall of the case is disposed between the angle sensor and the permanent magnet member , wherein: the yoke includes a first yoke configured to cover a portion of the permanent magnet ; and the first yoke is configured to cover a side surface of the permanent magnet , wherein a boundary region between a north pole and a south pole of the side surface of the permanent magnet is exposed without being covered by the first yoke . a valve body ; a driver configured to move the valve body along a first axis (Z); a rotation shaft configured to rotate the driver around the first axis; characterized in that the electrically operated valve further comprises: an angle sensor ; a permanent magnet member disposed on the rotation shaft and configured to rotate with the rotation shaft ; wherein the angle sensor is disposed above a permanent magnet included in the permanent magnet member and configured to detect a rotation angle of the permanent magnet ; wherein the electrically operated valve further comprises a yoke configured to cover a portion of the permanent magnet and optionally a portion of the angle sensor ; and a case configured to contain the permanent magnet member , wherein an end wall of the case is disposed between the angle sensor and the permanent magnet member , an angle sensor ; a permanent magnet member disposed on the rotation shaft and configured to rotate with the rotation shaft ; wherein the angle sensor is disposed above a permanent magnet included in the permanent magnet member and configured to detect a rotation angle of the permanent magnet ; wherein the electrically operated valve further comprises a yoke configured to cover a portion of the permanent magnet and optionally a portion of the angle sensor ; and a case configured to contain the permanent magnet member , wherein an end wall of the case is disposed between the angle sensor and the permanent magnet member , wherein: the yoke includes a first yoke configured to cover a portion of the permanent magnet ; and the first yoke is configured to cover a side surface of the permanent magnet , wherein a boundary region between a north pole and a south pole of the side surface of the permanent magnet is exposed without being covered by the first yoke . the yoke includes a first yoke configured to cover a portion of the permanent magnet ; and the first yoke is configured to cover a side surface of the permanent magnet , wherein a boundary region between a north pole and a south pole of the side surface of the permanent magnet is exposed without being covered by the first yoke . <EOS>