An expansion valve comprising: a valve main body including: an inlet passage configured to introduce a high-pressure refrigerant, a valve chamber configured to communicate with the inlet passage, an expansion chamber that includes an orifice configured to reduce a pressure of the refrigerant introduced into the valve chamber, and an outlet passage disposed downstream of the expansion chamber and configured to discharge the refrigerant that passes through the expansion chamber; a rectifier disposed in the valve main body and configured to partition the expansion chamber and the outlet passage; a valve member configured to open and close the orifice; and a valve member driving device configured to drive the valve member; wherein the rectifier has a substantially top hat shape and includes a circular sheet portion and a hollow cylindrically shaped convex portion projecting toward the outlet passage and integrally provided with the circular sheet portion, and a throttle hole formed at a distal end of the hollow convex portion, characterized in that the hollow convex portion has an outer diameter smaller than an inner diameter of a pipe connected to the outlet passage, the circular sheet portion and the hollow convex portion are eccentric to each other, and the outer periphery of the circular sheet portion is attached to the inner wall of the outlet passage by caulking or press-fitting. a valve main body including: an inlet passage configured to introduce a high-pressure refrigerant, a valve chamber configured to communicate with the inlet passage, an expansion chamber that includes an orifice configured to reduce a pressure of the refrigerant introduced into the valve chamber, and an outlet passage disposed downstream of the expansion chamber and configured to discharge the refrigerant that passes through the expansion chamber; an inlet passage configured to introduce a high-pressure refrigerant, a valve chamber configured to communicate with the inlet passage, an expansion chamber that includes an orifice configured to reduce a pressure of the refrigerant introduced into the valve chamber, and an outlet passage disposed downstream of the expansion chamber and configured to discharge the refrigerant that passes through the expansion chamber; a rectifier disposed in the valve main body and configured to partition the expansion chamber and the outlet passage; a valve member configured to open and close the orifice; and a valve member driving device configured to drive the valve member; wherein the rectifier has a substantially top hat shape and includes a circular sheet portion and a hollow cylindrically shaped convex portion projecting toward the outlet passage and integrally provided with the circular sheet portion, and a throttle hole formed at a distal end of the hollow convex portion, characterized in that the hollow convex portion has an outer diameter smaller than an inner diameter of a pipe connected to the outlet passage, the circular sheet portion and the hollow convex portion are eccentric to each other, and the outer periphery of the circular sheet portion is attached to the inner wall of the outlet passage by caulking or press-fitting.