MOTOR CONTROLLER

PROBLEM TO BE SOLVED: To provide a motor controller capable of accurately detecting step-out of a stepping motor without using an encoder.SOLUTION: A motor controller 60 includes: a driver 63 for outputting a current for driving a stepping motor 70 and outputting timing signals indicating a phase of the current; a calculation section 65 for calculating a difference between the target output time indicating the predetermined time at which the driver 63 is to output the timing signal and the actually measured output time indicating the time at which the driver 63 has outputted the timing signal; and a determination section 66 for determining whether or not the difference calculated by the calculation section 65 is equal to or larger than a predetermined threshold and determining the step-out of the stepping motor 70 when the difference is equal to or larger than the predetermined threshold.