A speed limit display device for a vehicle, comprising: an indicator mountable in the vehicle, the indicator configured to display information related to a speed limit (Vst_new) of a road on which the vehicle is traveling; an image obtaining device configured to capture an image of a landscape in a direction in which the vehicle is traveling and obtain image data of the landscape, the captured image being displayed on a specific screen; and a processing portion configured to detect a traffic sign in the landscape based on the image data, to detect the speed limit (Vst_new) indicated on the traffic sign, wherein the processing portion is configured to identify a diameter matching point when a diameter of the traffic sign on the specific screen matches a certain constant diameter, and to identify that the distance between the vehicle and the traffic sign in the vehicle advancing direction has reached a certain specified distance, wherein the processing portion is configured to obtain an actual sign installation distance (ΔD) that is the distance between the traffic sign and the vehicle when the vehicle is closest to the traffic sign obtained from the distance (Δd) at the diameter matching point, and the relationship, measured in advance, between the actual sign installation distance (ΔD) and the distance (Δd) between the center of the traffic sign on the specific screen and the center line that extends vertically through the center of the specific screen, the relationship being stored in a storage element of the speed limit display device; the processing portion is configured to determine whether a predetermined condition is satisfied when the traffic sign is detected based on the image data, the predetermined condition including a condition that the actual sign installation distance (ΔD) between the vehicle and the traffic sign be less than a predetermined distance (ΔDth); the processing portion is configured to display the detected speed limit (Vst_new) on the indicator when the predetermined condition is satisfied; and the processing portion is configured to not display the detected speed limit (Vst_new) on the indicator when the predetermined condition is not satisfied. an indicator mountable in the vehicle, the indicator configured to display information related to a speed limit (Vst_new) of a road on which the vehicle is traveling; an image obtaining device configured to capture an image of a landscape in a direction in which the vehicle is traveling and obtain image data of the landscape, the captured image being displayed on a specific screen; and a processing portion configured to detect a traffic sign in the landscape based on the image data, to detect the speed limit (Vst_new) indicated on the traffic sign, wherein the processing portion is configured to identify a diameter matching point when a diameter of the traffic sign on the specific screen matches a certain constant diameter, and to identify that the distance between the vehicle and the traffic sign in the vehicle advancing direction has reached a certain specified distance, wherein the processing portion is configured to obtain an actual sign installation distance (ΔD) that is the distance between the traffic sign and the vehicle when the vehicle is closest to the traffic sign obtained from the distance (Δd) at the diameter matching point, and the relationship, measured in advance, between the actual sign installation distance (ΔD) and the distance (Δd) between the center of the traffic sign on the specific screen and the center line that extends vertically through the center of the specific screen, the relationship being stored in a storage element of the speed limit display device; the processing portion is configured to determine whether a predetermined condition is satisfied when the traffic sign is detected based on the image data, the predetermined condition including a condition that the actual sign installation distance (ΔD) between the vehicle and the traffic sign be less than a predetermined distance (ΔDth); the processing portion is configured to display the detected speed limit (Vst_new) on the indicator when the predetermined condition is satisfied; and the processing portion is configured to not display the detected speed limit (Vst_new) on the indicator when the predetermined condition is not satisfied.