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 (I) drive-coupled to an internal combustion engine (ENG) to an output member (O) drive-coupled to wheels (W), a first engagement device (CL1) that operates by hydraulic pressure, a rotating electrical machine (MG), and a transmission (TM) are provided in this order from an internal combustion engine (ENG) side, the control device comprising: an engagement control part that controls a state of engagement of the first engagement device (CL1) based on an engagement control instruction; a hydraulic pressure information obtaining part that obtains hydraulic pressure information indicating first hydraulic pressure (P1) supplied to the first engagement device (CL1); an acceleration information obtaining part that obtains acceleration information indicating acceleration (A) of a vehicle on which the vehicle drive device is provided; and a determining part that determines a state of the first engagement device (CL1), wherein when an input rotational speed (Nm) is greater than zero and a state of the transmission (TM) 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 (MG); the engagement control instruction is a disengagement instruction to bring the first engagement device (CL1) into a disengaged state; the first hydraulic pressure (P1) indicated by the hydraulic pressure information is greater than a first threshold value (TH1); and acceleration (A) indicated by the acceleration information has a negative value smaller than a second threshold value (TH2), the determining part performs at least one of first control that brings the first engagement device (CL1) into a disengaged state and second control that interrupts transmission of drive power between the rotating electrical machine (MG) and the output member (O). an engagement control part that controls a state of engagement of the first engagement device (CL1) based on an engagement control instruction; a hydraulic pressure information obtaining part that obtains hydraulic pressure information indicating first hydraulic pressure (P1) supplied to the first engagement device (CL1); an acceleration information obtaining part that obtains acceleration information indicating acceleration (A) of a vehicle on which the vehicle drive device is provided; and a determining part that determines a state of the first engagement device (CL1), wherein when an input rotational speed (Nm) is greater than zero and a state of the transmission (TM) 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 (MG); the engagement control instruction is a disengagement instruction to bring the first engagement device (CL1) into a disengaged state; the first hydraulic pressure (P1) indicated by the hydraulic pressure information is greater than a first threshold value (TH1); and acceleration (A) indicated by the acceleration information has a negative value smaller than a second threshold value (TH2), the determining part performs at least one of first control that brings the first engagement device (CL1) into a disengaged state and second control that interrupts transmission of drive power between the rotating electrical machine (MG) and the output member (O). <EOS>