To provide a diesel engine in which ignition is possible reliably while suppressing the exhaust amount of carbon dioxide.

The diesel engine 1 includes: a first gas fuel injection valve 50 for injecting gas fuel into a cylinder chamber CC; an ignition chamber 80 communicating with the cylinder chamber CC; a pilot valve 60 for injecting ignition fuel into the ignition chamber 80; and a second gas fuel injection valve 70 for injecting the gas fuel into the ignition chamber 80.