To urge a user an air pressure adjustment so that the air pressure of a tire becomes an appropriate value when the temperature of the tire comes to be a normal temperature, relating to a control device of a tire pressure monitoring system.

When, in an initializing mode, it is determined that an air pressure P2 of a tire goes out of a range of appropriate air pressure when a current temperature T1 of the tire comes to be a normal temperature Ta based on a received information signal, a limitation is applied with no setting of an air pressure threshold value performed, which is to be reported. By this, a user can recognize the fact that, through the report about the limitation, the air pressure of a current tire after air pressure adjustment does not come into an appropriate range when the normal temperature Ta is reached. Accordingly, the user can be urged for an air pressure adjustment such that the air pressure of the tire comes into an appropriate range when the temperature of the tire becomes the normal temperature Ta.