To provide a valve identification information registering system that can specify a tire position, by minimizing the number of part items.

A valve ID registering system registers valve ID used in a tire air pressure monitoring system of a vehicle in a control device. The valve identification information registering system includes a door opening-closing detecting part for detecting that a door is opened-closed, a cabin inside LF transmitter arranged in a cabin and transmitting a starting signal Swk for transmitting a detecting signal Stp including the valve ID to a tire valve when opening the door arranged in the vehicle, and a valve ID registering part for registering the valve ID by associating the tire position based on the detecting signal Stp transmitted by the tire valve started by the starting signal Swk by leaking the starting signal Swk to the cabin outside from the door of an opening state by transmitting the starting signal Swk from the cabin inside LF transmitter when the door becomes the opening state.