In order to prevent a damage on a component forming a pressure feed fuel passage and to reduce a fuel injection pump in size and weight, the pressure feed fuel passage having fuel discharge passage, fuel chamber and accommodation hole formed in respective cylinder heads is formed straightly in respective cylinder heads, and has communication port for communicating with fuel pressure chamber and fuel outlet which has an opening at an outer peripheral wall of the cylinder heads. Fuel pressurized in fuel pressure chamber at the cylinder head side is introduced into fuel chamber of cylinder head via fuel passage and fuel lines. Fuel pressurized in both fuel pressure chambers is merged at fuel chamber of cylinder head, and is supplied to a common-rail via fuel passage.