The nasal dilator of this invention comprises a truss which includes a resilient spring member secured between a base layer and a cover member. The cover member extends beyond the perimeter of the spring member for maximum adherence of the truss to the outer skin surface of the nose of a wearer. The lateral sides of the dilator are angled to correspond to the line where the nose meets the cheek, and a separation, projection, or other index marker is formed member midway between the end edges of the truss, to assist centering the dilator on the nose. In one embodiment the spring member is formed with end pairs of resilient spring fingers configured to provide dilating force to the vestibule area of the nose, in addition to the valve area. The dilator construction allows mass production on a continuous basis by forming continuous, web-connected spring members laminated between continuous strips of flexible base layer and cover member material, and then cutting through the laminate along lines defining the outer periphery of the dilator.