To provide a control device for a premixed charge compression ignition combustion type internal combustion engine capable of stably operating over a wide range of operation zone.

The engine control device 100 is provided with a main fuel supply system 20 supplying main fuel, and a gas formation supply system 30 forming hydrogen and reformed gas containing hydrogen from the main fuel and supplying the same as premixed gas. The main fuel supply system 20 comprises a fuel tank 2, a low pressure pump 3A, a high pressure fuel supply system 21, and a fuel injector 22. The gas formation supply system 30 mainly comprises a fuel reformer 31 forming hydrogen or reformed gas containing hydrogen by reforming main fuel, a gas compressor 33, a pressure accumulation tank 34, a premixed gas pressure regulation valve 35, a header pipe 36, and a gas injector 32 injecting the reformed gas to each cylinder. Premixed gas stored in the pressure accumulation tank 34 is decompressed to prescribed injection pressure based on signal of a pressure sensor SPgand is injected into intake air from the injection hole of the gas injector 32.

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