An operation unit provided on a grip part of a steering wheel, and having an operation panel in which contact operations are possible by the fingers of an operator; an operation detection unit that detects contact operations with respect to the operation panel with a predetermined coordinate system as a reference; a display control unit that controls the display of a display device according to the contact operations detected by the operation detection unit; a correction unit that corrects a coordinate system according to a steering angle detected by a steering angle detection device; and a correction prohibition device that, based on at least one from among contact operations detected by the operation detection device, a steering angle detected by a steering angle sensor, and a speed detected by a speed sensor, prohibits correction of the coordinate system by the correction unit.