Travel control device, vehicle, and travel control method

A travel control device that executes adaptive cruise control (ACC) for allowing a host vehicle to follow a leading vehicle and travel at a constant speed while keeping a preset inter-vehicle distance, the travel control device comprising:

• a leading vehicle detection section that, after the leading vehicle being followed at a speed equal to or lower than a preset vehicle speed has disappeared, determines whether a new leading vehicle has been detected in a predetermined time;
• a speed determination section that, when the new leading vehicle has been detected, determines whether a speed difference between a speed of the host vehicle and a speed of the new leading vehicle is within a set range based on zero;
• and
• a travel control section that, when the speed difference is within the set range, controls the host vehicle to disable acceleration for reducing an inter-vehicle distance between the host vehicle and the new leading vehicle to the preset inter-vehicle distance.