A control valve for controlling the flow of fluid, comprising: a seat portion through which the fluid passes, the seat portion having an upstream end and a downstream end; a poppet which has a valve body portion and is configured to move relative to the seat portion; and a poppet throttle passage defined between the seat portion and the valve body portion, wherein: a valve seat angle (θ 1) between two virtual lines extending along the inner peripheral surface of the seat portion is larger than a valve body angle (θ 2) between two virtual lines extending along the outer peripheral surface of the valve body portion in a vertical cross-section including the center axis of the seat portion and the valve body portion, characterized in that the valve body portion has a constant conical surface and is configured to be seated on the upstream end of the seat portion, an angle difference (θ 1 -θ 2) between the valve seat angle (θ 1) and the valve body angle (θ 2) is in a range of not larger than 1.5°, the poppet throttle passage is formed to gradually increase a flow passage area in a horizontal cross-section perpendicular to center axes of the seat portion and the valve body portion from the upstream end to the downstream end of the seat portion, and a length of the poppet throttle passage in a direction of the center axis of the seat portion is larger than an opening diameter of the upstream end of the seat portion. a seat portion through which the fluid passes, the seat portion having an upstream end and a downstream end; a poppet which has a valve body portion and is configured to move relative to the seat portion; and a poppet throttle passage defined between the seat portion and the valve body portion, wherein: a valve seat angle (θ 1) between two virtual lines extending along the inner peripheral surface of the seat portion is larger than a valve body angle (θ 2) between two virtual lines extending along the outer peripheral surface of the valve body portion in a vertical cross-section including the center axis of the seat portion and the valve body portion, characterized in that the valve body portion has a constant conical surface and is configured to be seated on the upstream end of the seat portion, an angle difference (θ 1 -θ 2) between the valve seat angle (θ 1) and the valve body angle (θ 2) is in a range of not larger than 1.5°, the poppet throttle passage is formed to gradually increase a flow passage area in a horizontal cross-section perpendicular to center axes of the seat portion and the valve body portion from the upstream end to the downstream end of the seat portion, and a length of the poppet throttle passage in a direction of the center axis of the seat portion is larger than an opening diameter of the upstream end of the seat portion. a valve seat angle (θ 1) between two virtual lines extending along the inner peripheral surface of the seat portion is larger than a valve body angle (θ 2) between two virtual lines extending along the outer peripheral surface of the valve body portion in a vertical cross-section including the center axis of the seat portion and the valve body portion, characterized in that the valve body portion has a constant conical surface and is configured to be seated on the upstream end of the seat portion, an angle difference (θ 1 -θ 2) between the valve seat angle (θ 1) and the valve body angle (θ 2) is in a range of not larger than 1.5°, the poppet throttle passage is formed to gradually increase a flow passage area in a horizontal cross-section perpendicular to center axes of the seat portion and the valve body portion from the upstream end to the downstream end of the seat portion, and a length of the poppet throttle passage in a direction of the center axis of the seat portion is larger than an opening diameter of the upstream end of the seat portion.