A control device for a vehicle drive device, a control target for the control device being the vehicle drive device in which in a power transmission path connecting an input member drive-coupled to an internal combustion engine to an output member drive-coupled to wheels, a first engagement device that operates by hydraulic pressure, a rotating electrical machine, and a transmission are provided in this order from an internal combustion engine side, the control device comprising: an engagement control part that controls a state of engagement of the first engagement device based on an engagement control instruction; a hydraulic pressure information obtaining part that obtains hydraulic pressure information indicating first hydraulic pressure supplied to the first engagement device; an acceleration information obtaining part that obtains acceleration information indicating acceleration of a vehicle on which the vehicle drive device is provided; and a determining part that determines a state of the first engagement device, wherein when an input rotational speed (Nm) is greater than zero and a state of the transmission is a drive transmission state in which drive power is transmitted, the input rotational speed (Nm) being a rotational speed of the rotating electrical machine; the engagement control instruction is a disengagement instruction to bring the first engagement device into a disengaged state; the first hydraulic pressure indicated by the hydraulic pressure information is greater than a first threshold value; and acceleration indicated by the acceleration information has a negative value smaller than a second threshold value, the determining part performs at least one of first control that brings the first engagement device into a disengaged state and second control that interrupts transmission of drive power between the rotating electrical machine and the output member. an engagement control part that controls a state of engagement of the first engagement device based on an engagement control instruction; a hydraulic pressure information obtaining part that obtains hydraulic pressure information indicating first hydraulic pressure supplied to the first engagement device; an acceleration information obtaining part that obtains acceleration information indicating acceleration of a vehicle on which the vehicle drive device is provided; and a determining part that determines a state of the first engagement device, wherein when an input rotational speed (Nm) is greater than zero and a state of the transmission is a drive transmission state in which drive power is transmitted, the input rotational speed (Nm) being a rotational speed of the rotating electrical machine; the engagement control instruction is a disengagement instruction to bring the first engagement device into a disengaged state; the first hydraulic pressure indicated by the hydraulic pressure information is greater than a first threshold value; and acceleration indicated by the acceleration information has a negative value smaller than a second threshold value, the determining part performs at least one of first control that brings the first engagement device into a disengaged state and second control that interrupts transmission of drive power between the rotating electrical machine and the output member.