Projection image display member, windshield glass, and head-up display system

A projection image display member comprising, in the following order:

• at least one phase difference layer;
• two or more of selective reflection layers;
• and
• at least one polarization conversion layer,
• wherein the polarization conversion layer is a layer in which a helical alignment structure of a liquid crystal compound is fixed,
• the number of pitches x of the helical alignment structure and a film thickness y (unit of μm) of the polarization conversion layer satisfy all of the following Relational Expressions,
• 0.3≤x≤7.0, (i)
• 0.5≤y≤6.0, (ii)
• y≤0.7x+3.2, (iii)
• and
• y≥0.7x−1.4, (iv)
• the number of pitches x of the helical alignment structure and the film thickness y (unit of μm) of the polarization conversion layer satisfy all of the following Relational Expressions,
• 0.3≤x≤1.2, (v)
• 1.0≤y≤3.0, (vi)
• and
• y≥1.875x, (vii)
• the polarization conversion layer exhibits optical turning properties and birefringence with respect to visible light, and
• the two or more of the selective reflection layers have selective reflection center wavelengths different from each other.