DISCHARGE VALVE MECHANISM AND HIGH-PRESSURE FUEL SUPPLY PUMP INCLUDING THE SAME

Provided is a discharge valve mechanism capable of improving responsiveness when a discharge valve is opened, and a high-pressure fuel supply pump including the discharge valve mechanism. A discharge valve mechanism includes a valve seat portion having a primary-side flow path, a valve body which can be seated on and separated from the valve seat portion and a guide portion which is formed to be slidable on an outer surface of the valve body and guides movement of the valve body in a contacting/separating direction with respect to the valve seat portion The guide portion includes a portion in which a gap from the outer surface of the valve body is set to a predetermined value or less. A first secondary-side flow path which allows an internal space on an upstream side of the guide portion to communicate with an external flow path is formed to allow the fluid to flow out to a side in a moving direction of the valve body and a second secondary-side flow path which allows an internal space on a downstream side of the guide portion to communicate with the external flow path is formed to allow the fluid to flow out to the side in the moving direction of the valve body