Fuel supply device

A fuel supply device for a four-cycle internal combustion engine using hydrogen as fuel and including a plurality of cylinders, comprising:

• an intake passage including an intake manifold branching from an upstream end toward a downstream end so as to correspond to the number of cylinders, a single pipe portion on the upstream end of the intake manifold so that a downstream end of the single pipe portion is connected in series to the upstream end of the intake manifold, and a plurality of intake port portions on the downstream end of the intake manifold, wherein a downstream end of each of the plurality of intake port portions is connected respectively to the plurality of cylinders;
• and a plurality of first fuel injection valves provided in each of the intake port portions, wherein a maximum injection period of the first fuel injection valve is a value corresponding to a valve opening period of an intake valve of the internal combustion engine, a second fuel injection valve is provided in the single pipe portion downstream of the throttle valve and upstream of the intake manifold, and a minimum injection quantity of the second fuel injection valve is smaller than a minimum injection quantity of the first fuel injection valve.