Windshield

A windshield having an ARHUD region for displaying, superimposed on an outside view seen from outside a vehicle, a first image emitted from a head-up display device,

• the windshield comprising a glass member having a plate shape and having the ARHUD region,
• wherein in the ARHUD region, when slopes relating to a surface shape of the glass member are defined and a longitudinal difference between the slopes is defined as X1, the windshield satisfies an expression shown below:
• X
• ⁢
• 1
• <
• 0.0008
• (
• rad
• /
• mm
• )
• wherein in the ARHUD region,
• when m points in a horizontal direction and n points in a perpendicular direction, that is, a total of m×n points Aij (1≤i≤m, 1≤j≤n) arranged in a lattice pattern are defined, and
• in a surface of the glass member on a vehicle interior side, an inclination angle, that is, a slope between perpendicularly adjacent points Aij and Ai(j+1) (1≤i≤m, 1≤j≤n−1) is defined as θAij (rad),
• X1 is a value obtained by dividing a difference between two angles, that is, an arbitrary angle θAij and another angle θAij (excluding angles at points at an identical position in the horizontal direction) by a distance between two points corresponding to the two angles in the perpendicular direction.