Vehicle deceleration assist control device

A vehicle deceleration assist control device including an accelerator operation amount detection device that detects an accelerator operation amount, a deceleration target detection device that detects a deceleration target in front of a vehicle, a deceleration device that decelerates the vehicle, and a control unit that controls the deceleration device, the control unit being configured to perform deceleration assist control in an accelerator operation amount mode in which the vehicle is decelerated according to the accelerator operation amount by controlling the deceleration device when the deceleration target is detected in a situation where the accelerator operation amount exceeds a reference value, wherein the control unit is configured to calculate a target deceleration for causing a vehicle speed of the vehicle at a time when the vehicle reaches a position of the deceleration target to be a target vehicle speed determined according to a type of the deceleration target, set a mode change timing according to the type of the deceleration target, and make a mode change from the accelerator operation amount mode to a non-accelerator operation amount mode in which the vehicle is decelerated based on the target deceleration when it is determined to be the mode change timing.