A dual-system fuel injection engine has inlet ports (11) each extending at cylinder head (6) obliquely upward from a combustion chamber (16); an inlet manifold (21) connected at its downstream side end section to the inlet port s (11); an in-cylinder injector (15) for each of the cylinders, injecting fuel directly into the combustion chamber (16); and a inlet pipe injector (56) fo r each cylinder, injecting fuel into the inlet port (11). The in-cylinder injector (15) is attached to the cylinder head (6) and is positioned on the lower side of the inlet port (11) when viewed from the direction of the axis of a crankshaft (27). The inlet pipe injector (56) and a low-pressure delive ry pipe (57) for supplying fuel to all the inlet pipe injectors (56) are supported at the inlet manifold (21) and are positioned, when viewed from th e direction of the axis of the crankshaft (27), on the upper side of the inlet port (11) so as to be close to the inlet port (11).
