A shift transmission control device of a vehicle includes a transmission, a clutch, a shift transmission controller, and a shift inhibition state detector. The shift transmission controller is configured to control the transmission and the clutch. The shift inhibition state detector is configured to detect based on a running state of the vehicle that a predetermined shift inhibition condition is satisfied. The transmission is capable of providing a preliminary change gear ratio while the predetermined change gear ratio at which the rotational drive force is transmitted to the drive wheel is maintained. The shift transmission controller is configured to control the transmission to inhibit a change of the predetermined change gear ratio at which the rotational drive force is transmitted to the drive wheel and to provide the preliminary change gear ratio in response to the running state of the vehicle when the shift inhibition condition is satisfied.