SPEED CALCULATION DEVICE, SPEED CALCULATION METHOD, SPEED CALCULATION PROGRAM, AND RECORDING MEDIUM

PROBLEM TO BE SOLVED: To calculate a travel speed close to an actual travel speed without using vehicle speed signals.SOLUTION: A speed calculation device 100 which is mounted on a moving body, comprises an angle detection unit 101, a first acceleration detection unit 102, a first calculation unit 103, and an output unit 104. The angle detection unit 101 detects a roll angle indicating lateral inclination of a vehicle and a yaw angle at which the vehicle turns. The first acceleration detection unit 102 detects acceleration in an orthogonal and horizontal direction against a travel direction of the vehicle. The first calculation unit 103 calculates a travel speed when the moving body turns on the basis of the roll angle and yaw angle detected by the angle detection unit 101 and the acceleration detected by the first acceleration detection unit 102. The output unit 104 outputs the travel speed calculated by the first calculation unit 103.