Laminated glass interlayer film and laminated glass

A laminated glass having one end and the other end on an opposite side of the one end,

• the other end having a thickness larger than a thickness of the one end, the laminated glass comprising:
• a first lamination glass member, a second lamination glass member, and an interlayer film,
• the interlayer film being arranged between the first lamination glass member and the second lamination glass member,
• the interlayer film comprising a first layer, a second layer, a third layer and a colored layer,
• the second layer being arranged on a first surface side of the first layer,
• the third layer being arranged on a second surface side opposite to the first surface of the first layer,
• the colored layer being embedded between the first layer and the second layer,
• when measurement of parallel light transmittance below is conducted for the laminated glass, the laminated glass having:
• a gradation part in which a parallel light transmittance continuously reduces from the one end side to the other end side, and an absolute value of a variation rate in the parallel light transmittance is more than 0.3%/mm;
• a transparent part located closer to the one end side than the gradation part and having a parallel light transmittance of 60% or more;
• and
• a dark color part located closer to the other end side than the gradation part and including four or more points A having an absolute value of a variation rate in the parallel light transmittance of 0.3%/mm or less;
• wherein
• each of the gradation part and the dark color part has the colored layer, wherein a thickness of the colored layer in the gradation part continuously increases towards the other end, and wherein a thickness of the colored layer in the dark color part is uniform;
• and
• wherein the measurement of the parallel light transmittance includes:
• selecting a plurality of points A at 1 cm intervals from a starting point toward the other end, the starting point being a position of 2 cm from the one end toward the other end;
• measuring a parallel light transmittance of the laminated glass at each point A;
• defining that an x-axial direction is “distance from the one end” and a y-axial direction is “parallel light transmittance”, and preparing an approximate line in a region of 2 cm from three points including one point A and two points 1 cm distanced from the point A on both sides in a direction connecting the one end and the other end;
• defining an absolute value of a variation rate in the parallel light transmittance determined from the approximate line as “absolute value of variation rate in parallel light transmittance” at the one point A;
• and
• determining “absolute value of variation rate in parallel light transmittance” for each point A.