Fuel injection pump for the sliding member and the sliding member

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PROBLEM TO BE SOLVED : To provide a pump for jetting a fuel, having improved reliability, durability and abrasion resistance at an inexpensive manufacturing cost. SOLUTION : In this pump for jetting a fuel by sending a fuel from a fuel tank under pressure, raising pressure and supplying the fuel to a jetting nozzle, sliding members of a driving shaft 1, a plunger 6, a roller 7, etc., are composed of a sintered silicon nitride comprising 7β-silicon nitride crystal phase as a main component, containing a grain boundary phase consisting of a rare earth element, aluminum, oxygen and nitrogen, having the ratio of the maximum peak of silicon nitride and the peak (521 cm-1) of Si detected by Raman spectroscopy of 0.2-3.