An engine controller in which abnormality of a crankshaft due to the fixing accuracy of a crank angle sensor, or the like, can be detected surely. A decision is made that a crank pulse is abnormal when a state where a crank pulse counter T at a normal pitch does not have a specified value T0 during an interval of detecting an unequal pitch (interval abnormality) is repeated a specified value CNT0or more, or the time during which an unequal pitch cannot be detected continues not shorter than the count up value TMAX of the crank pulse counter T, or a state where a crank pulse of a specified value or above cannot be detected within a specified time is repeated a count up value KMAX or more.