To provide an internal combustion engine control device (100) in which a control unit (107b) controls an operating condition of an internal combustion engine (1) based on a difference ΔTCC between a first temperature TCC corresponding to the temperature of a first portion in a wall defining a combustion chamber of the internal combustion engine (1), and a second temperature TE corresponding to the temperature of a second portion on an outer wall surface side than the first portion in the wall.