To provide a road information generating device for generating exact road information by acquiring a travel trajectory matched with an actual road shape; a road information generating method; and a program.

When a vehicle is in a lane-keeping-drive state, a CPU 41 collects respective data such as the position of own vehicle, azimuth of own vehicle, the operation state of a lane keeping ECU 51, operation state of turn signal lamps 62A and 62B when the vehicle travels on a road which is not on a map stored in a map information DB 25. When the lane-keeping-drive is in a stopping state, the CPU 41 generates road map data (road information such as node data and link data) on the basis of the respective data collected as travel trajectory data such as own vehicle position, own vehicle azimuth, the operation state of the lane keeping ECU 51, the operation state of turn signal lamps 62A and 62B and additionally stores (S111-S116) the road map data in the map information stored in the road map DB 25.