A manipulator controller according to one or more embodiments may include a tilt angle obtainer that obtains a tilt angle of a movable unit receiving a robot relative to a reference surface, a target position obtainer that obtains a target position of the robot on the movable unit having no tilt to the reference surface, a correction unit that corrects, based on the tilt angle obtained by the tilt angle obtainer and the target position obtained by the target position obtainer, the target position to a corrected target position in accordance with the tilt angle, and a control unit that controls an operation of the robot based on the corrected target position.