High pressure fuel pump

A high pressure fuel pump includes a plunger, which slidably reciprocates along a slide axis in an inside of a cylinder, a tappet body, which reciprocates integrally with the plunger, and a roller, which is held by the tappet body and is rotated by rotation of a camshaft. When the roller and the cam main body are viewed in a direction of an axis of the camshaft, a contact point, at which the roller and the cam main body contact with each other, is displaced from an intersection point, at which the slide axis of the plunger and a tangent line to a circle of a cross section of the roller at the contact point intersect with each other, in a counter-rotational direction of the cam main body, which is opposite from a rotational direction of the cam main body.