Fuel injection pump

A drive shaft (14) transmits rotational force to a cam (17) whose rotation reciprocates a plunger (20), pressurizing fuel in the fuel pressure chambers (30) and transmitting the pressurized fuel to a fuel discharge passage (32), fuel chamber (33) and accommodation hole (34) which are formed each having a communication port (32a) and a fuel outlet (34a) in the cylinder heads (12,13). A main housing (11) supports the drive shaft.