A vehicle surroundings monitoring device (Fig. 1) having an imager configured to capture images of the surroundings of a vehicle with one or more cameras (1R, 1L) mounted to a vehicle, and an image processing unit comprising a processor and a memory, said image processing unit being configured to: acquire, via imaging with the imager, a gray scale image having an intensity corresponding to a temperature of an object; detect (S17-S24) one or more predetermined target objects in the surroundings of the vehicle by analyzing brightness in the acquired gray scale image; produce a display image to be displayed on a display unit mounted to the vehicle based on the gray scale image; and supply the display image to the display unit; the vehicle surroundings monitoring device being characterized in that the image processing unit is further configured to: determine (S41-S43), for each of the target objects in the surroundings of the vehicle a possibility of collision with said vehicle, determine the target objects having high possibility to collide with the vehicle as potentially colliding objects; determine a deceleration of the vehicle; calculate, based on a velocity of said each potentially colliding object relative to the vehicle and a distance of each of the potentially colliding objects with respect to the vehicle, a threshold value of the deceleration for each of the potentially colliding objects; and produce the display image by decreasing the intensity of the region other than the potentially colliding objects in the gray scale image, when the determined deceleration is not larger than at least one of the calculated threshold values. acquire, via imaging with the imager, a gray scale image having an intensity corresponding to a temperature of an object; detect (S17-S24) one or more predetermined target objects in the surroundings of the vehicle by analyzing brightness in the acquired gray scale image; produce a display image to be displayed on a display unit mounted to the vehicle based on the gray scale image; and supply the display image to the display unit; the vehicle surroundings monitoring device being characterized in that the image processing unit is further configured to: determine (S41-S43), for each of the target objects in the surroundings of the vehicle a possibility of collision with said vehicle, determine the target objects having high possibility to collide with the vehicle as potentially colliding objects; determine a deceleration of the vehicle; calculate, based on a velocity of said each potentially colliding object relative to the vehicle and a distance of each of the potentially colliding objects with respect to the vehicle, a threshold value of the deceleration for each of the potentially colliding objects; and produce the display image by decreasing the intensity of the region other than the potentially colliding objects in the gray scale image, when the determined deceleration is not larger than at least one of the calculated threshold values. determine (S41-S43), for each of the target objects in the surroundings of the vehicle a possibility of collision with said vehicle, determine the target objects having high possibility to collide with the vehicle as potentially colliding objects; determine a deceleration of the vehicle; calculate, based on a velocity of said each potentially colliding object relative to the vehicle and a distance of each of the potentially colliding objects with respect to the vehicle, a threshold value of the deceleration for each of the potentially colliding objects; and produce the display image by decreasing the intensity of the region other than the potentially colliding objects in the gray scale image, when the determined deceleration is not larger than at least one of the calculated threshold values.