An information providing device 1 of a motorcycle includes: an image acquisition section 10 that acquires an image of a road; a lane detection section 12 that detects a lane from the image and detects a radius of curvature of the detected lane and a lateral distance from the host vehicle to the lane; a host vehicle trajectory curvature calculation section 14 that calculates a radius of curvature of a host vehicle trajectory on the basis of the radius of curvature of the lane and the lateral distance; a vehicle speed acquisition section 16 that acquires a vehicle speed of the host vehicle; an inclination angle calculation section 18 that calculates an inclination angle of the host vehicle on the basis of the radius of curvature of the host vehicle trajectory and the vehicle speed.