To provide a vehicular steering device employing a steer-by-wire capable of warning abnormal air pressure of a wheel tire via a steering wheel.

A steer-by-wire steering device for performing mechanical disconnection of a steering wheel from a steering gear box turns right and left wheels by controlling the operation of a steering actuator, and controls the operation of a steering reaction force generating means so as to obtain the steering reaction force retrieved by applying the steering angle of the steering wheel to a steering angle-steering reaction force map. An electronic control unit to control the operation of the steering reaction force generating means provides the offset amount θm to the center of the steering angle-steering reaction force map according to the differential air pressure of the right and left wheel tires to allow the steering wheel to be positively controlled to the wheel side with the dropped air pressure of the tire, and warns a driver of the drop in the air pressure of the tire.