Misfire detection device for internal combustion engine

A misfire detection device for an internal combustion engine that includes a plurality of cylinders, the misfire detection device comprising

• an electronic control unit configured to:
• detect continuous misfire in at least one cylinder based on a rotation change value, the rotation change value being a value quantified as a difference in a rotational behavior of a crankshaft shown on a crank signal in a rotation angle interval that shows an influence of combustion in each of a pair of cylinders successive in time series order of compression top dead center timing;
• execute a first component calculation process based on the crank signal, the first component calculation process being a process of calculating a first component that is a first integer multiple frequency component of a combustion cycle related to the rotation change value;
• execute a second component calculation process based on the crank signal, the second component calculation process being a process of calculating a second component that is different from the first component and is a second integer multiple frequency component of the combustion cycle related to the rotation change value;
• determine whether the second component has a maximum value or a minimum value in at least one of two phases of a phase where the first component has a maximum value and a phase where the first component has a minimum value;
• and
• execute a misfire determination process of determining an interval between compression top dead centers of cylinders having the continuous misfire based on a determination result of whether the second component has the maximum value or the minimum value.