CONTROLLER AND CONTROL METHOD

The present invention obtains a controller and a control method capable of appropriately stabilizing behavior of a rear wheel of a straddle-type vehicle. In the controller and the control method according to the present invention, a slip amount of a wheel of a straddle-type vehicle () is controlled to be equal to or smaller than an allowable slip amount. In the case where it is determined that behavior of a rear wheel () of the straddle-type vehicle () is in an unstable state on the basis of a slip angle () of the straddle-type vehicle (), stabilization control is executed to reduce the allowable slip amount of the rear wheel () to be smaller than the allowable slip amount of the rear wheel () at the time when it is determined that the behavior of the rear wheel () is in the stable state.