To provide an engine gaseous fuel supply device enabling a gaseous fuel injection valve to early and properly operate by early raising temperature of sliding portions of a valve seat and a valve element of the gaseous fuel injection valve after start of an engine to reduce viscosity of oil adherent to them.

The engine gaseous fuel supply device comprises the gaseous fuel injection valve 10, which has a valve housing 42 having at one end a fuel inlet port 76 connected to a gas fuel tank 9, a nozzle member 51 provided at the other end of the valve housing 42 and having the valve seat 53 and a nozzle hole 54 penetrating a central portion of the valve seat 53, and the valve element 55 slidably fitted in a guide hole 49 of the valve housing 42 for opening and closing the nozzle hole 54 in cooperation with the valve seat 53 at one end surface. A heating chamber 15 is arranged around the valve housing 42 for heating the vicinity of the valve seat 53 and the guide hole 49 and cooling water of the engine E is let flow through the heating chamber 15 as a heat source.

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