Control device and control method

A control device (20) for controlling a behavior of a straddle type vehicle (1), the control device configure to:

• execute a positional relationship adjusting operation that adjusts a positional relationship between an own vehicle (1) and a vehicle set as a target vehicle in the other vehicles (2) constituting a group, including a plurality of straddle type vehicles including the own vehicle (1) and traveling in a plurality of convoys as a group, to be a target positional relationship,
• wherein in the positional relationship adjusting operation, the control device sets the other vehicle (2) detected by a surrounding environment sensor (14) installed to the own vehicle (1) as the target vehicle, executes speed control for controlling a speed of the own vehicle (1) to a target speed when the target vehicle is not set, and executes an acceleration increase suppression operation that suppresses an increase in acceleration of the own vehicle (1) compared to an increase in acceleration of the own vehicle (1) when a second other vehicle (2a) corresponding to the other vehicle (2) located in the convoy to which the own vehicle (1) belongs is set as the target vehicle in a case where a first other vehicle (2b) is no more detected by the surrounding environment sensor (14) in a situation in which the first other vehicle (2b) corresponding to the other vehicle (2) located in the convoy to which the own vehicle (1) does not belong is set as the target vehicle or compared to an increase in acceleration of the own vehicle (1) when the speed control is executed without setting the target vehicle.