An electric valve comprising: a valve main body including a valve chamber and a valve seat attached to a valve opening; and a valve body for changing a flow rate of a fluid flowing through the valve opening in response to a lift amount, wherein the valve body is provided with a seat surface portion for sitting on the valve seat in a contact state, with a valve body cylindrical portion connected to the lower side of the seat surface portion and having a constant outer diameter (φA) in a direction of a center axis of the valve body, and with a curved surface portion connected to the lower side of the valve body cylindrical portion and having a curvature or an intersection angle with a line parallel to the center axis of the valve body, the intersection angle continuously or gradually increasing while approaching to an end of the curved surface portion, wherein the valve opening is provided with a narrowest portion having a an inner diameter (φB) that is larger than the constant outer diameter (φA) of the valve body cylindrical portion and an inner diameter (φC) of the valve seat is larger than the inner diameter (φB) of the narrowest portion, wherein a portion of the valve opening which is between the narrowest portion and the valve seat has a tapered surface with an inner diameter continuously decreasing while approaching toward the narrowest portion, characterized in that the curved surface portion comprises a plurality of stages including an upper tapered surface portion which is formed as a reverse conical surface, and tapered surface of the portion of the valve opening is configured to be parallel to the upper tapered surface portion of the valve body. a valve main body including a valve chamber and a valve seat attached to a valve opening; and a valve body for changing a flow rate of a fluid flowing through the valve opening in response to a lift amount, wherein the valve body is provided with a seat surface portion for sitting on the valve seat in a contact state, with a valve body cylindrical portion connected to the lower side of the seat surface portion and having a constant outer diameter (φA) in a direction of a center axis of the valve body, and with a curved surface portion connected to the lower side of the valve body cylindrical portion and having a curvature or an intersection angle with a line parallel to the center axis of the valve body, the intersection angle continuously or gradually increasing while approaching to an end of the curved surface portion, wherein the valve opening is provided with a narrowest portion having a an inner diameter (φB) that is larger than the constant outer diameter (φA) of the valve body cylindrical portion and an inner diameter (φC) of the valve seat is larger than the inner diameter (φB) of the narrowest portion, wherein a portion of the valve opening which is between the narrowest portion and the valve seat has a tapered surface with an inner diameter continuously decreasing while approaching toward the narrowest portion, characterized in that the curved surface portion comprises a plurality of stages including an upper tapered surface portion which is formed as a reverse conical surface, and tapered surface of the portion of the valve opening is configured to be parallel to the upper tapered surface portion of the valve body.