A control unit for controlling a vehicle comprising a first rotating electric machine that serves as a driving source for running the vehicle and that exchanges electric power with a battery, and an engine that serves as another driving source, wherein; the vehicle comprises a first connecting/disconnecting mechanism disposed on a first power transmission path from the first rotating electric machine to a driving wheel, a second connecting/disconnecting mechanism disposed on a second power transmission path from the engine to the driving wheel, and a rotation speed sensor that detects, as an axle rotation speed (Na), a rotation speed correlated with a rotation speed of a side of the driving wheel; and a first running mode in which the vehicle is driven by power of the engine in a state where the second connecting/disconnecting mechanism is engaged, and another running mode in which the first connecting/disconnecting mechanism is engaged and the second connecting/disconnecting mechanism is disengaged are set for the vehicle; the control unit comprises: a connecting/disconnecting mechanism controller that disengages the first connecting/disconnecting mechanism when a predetermined condition is satisfied during the first running mode; a rotating electric machine controller that variably controls a standby rotation speed (Nw) of the first rotating electric machine when the first connecting/disconnecting mechanism is disengaged and the power transmission of the first power transmission path is shut; and a calculator that calculates a power supplying capability of the battery, the rotating electric machine controller controls the standby rotation speed (Nw) such that a difference between the axle rotation speed (Na) and the standby rotation speed (Nw) comes to be smaller when the power supplying capability is lower. the vehicle comprises a first connecting/disconnecting mechanism disposed on a first power transmission path from the first rotating electric machine to a driving wheel, a second connecting/disconnecting mechanism disposed on a second power transmission path from the engine to the driving wheel, and a rotation speed sensor that detects, as an axle rotation speed (Na), a rotation speed correlated with a rotation speed of a side of the driving wheel; and a first running mode in which the vehicle is driven by power of the engine in a state where the second connecting/disconnecting mechanism is engaged, and another running mode in which the first connecting/disconnecting mechanism is engaged and the second connecting/disconnecting mechanism is disengaged are set for the vehicle; the control unit comprises: a connecting/disconnecting mechanism controller that disengages the first connecting/disconnecting mechanism when a predetermined condition is satisfied during the first running mode; a rotating electric machine controller that variably controls a standby rotation speed (Nw) of the first rotating electric machine when the first connecting/disconnecting mechanism is disengaged and the power transmission of the first power transmission path is shut; and a calculator that calculates a power supplying capability of the battery, a connecting/disconnecting mechanism controller that disengages the first connecting/disconnecting mechanism when a predetermined condition is satisfied during the first running mode; a rotating electric machine controller that variably controls a standby rotation speed (Nw) of the first rotating electric machine when the first connecting/disconnecting mechanism is disengaged and the power transmission of the first power transmission path is shut; and a calculator that calculates a power supplying capability of the battery, the rotating electric machine controller controls the standby rotation speed (Nw) such that a difference between the axle rotation speed (Na) and the standby rotation speed (Nw) comes to be smaller when the power supplying capability is lower.