The purpose of the present invention is to provide: an electromagnetic valve structure that improves the responsiveness of an electromagnetic valve and provides more accurate flow rate control; and a high-pressure fuel supply pump having same mounted therein. The high-pressure fuel supply pump has the electromagnetic valve comprising: an electromagnetic coil that generates electromagnetic force for opening and closing a valve body provided between a fuel intake passage and a pressurized chamber; a movable element that operates by electromagnetic force; a housing that houses the movable element; and a back pressure chamber formed between the housing and the movable element. The high-pressure fuel supply pump is characterized by a first fuel passage passing through a central axis of the movable element, said first fuel passage connecting the back pressure chamber to the intake passage.