Antireflection film-equipped transparent substrate and image display device

An anti-reflective film-attached transparent substrate comprising:

• a transparent substrate comprising two main surfaces;
• and
• a diffusion layer and an anti-reflective film in this order from a transparent substrate side on one main surface of the transparent substrate,
• wherein when reflection on the other main surface of the transparent substrate is eliminated and a light source is incident on the one main surface at an incident angle of 45°, an absolute value of a slope of an approximate straight line calculated based on a*b* coordinates of diffusely reflected lights at angles of −15°, 15°, and 25° with respect to a specularly reflected light under a D65 light source is 2 or more.