To realize a fuel injection structure that can realize a high precision stratified charge, in an engine that injects fuel supplied to a fuel passage into a combustion chamber from a fuel injection hole.

The fuel injection hole 23 is formed in an injection hole forming surface 28 in a reentrant 30 defined in a wall surface 17a of the combustion chamber 6. On the injection hole forming surface 28, a reed 25 is arranged over the fuel injection hole 23, with one end fixed to the injection hole forming surface 28 and the other end elastically deformable to the combustion chamber 6 to open the fuel injection hole 23 to the combustion chamber 6.