Interlayer for laminated glass, and laminated glass

An interlayer film for laminated glass, comprising one end and an 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 interlayer film not containing or containing alkali metal,
• the interlayer film not containing or containing non-magnesium alkali earth metal,
• the interlayer film containing magnesium,
• wherein, when the interlayer film is heated at 150° C. for 30 minutes, the interlayer film forms a heated interlayer film satisfying each of the following conditions 1) to 4):
• 1) a content of magnesium in a surface portion of a first region of 3 cm square having a center line positioned at 15 cm toward the other end from the one end of the heated interlayer film is 1 ppm or more,
• 2) a content of magnesium in a surface portion of a second region of 3 cm square having a center line positioned at 15 cm toward the one end from the other end of the heated interlayer film is 1 ppm or more,
• 3) a total content of alkali metal, non-magnesium alkali earth metal and magnesium in the surface portion of the second region having 3 cm square having a center line positioned at 15 cm toward the one end from the other end of the heated interlayer film is 200 ppm or less,
• 4) the total content of alkali metal, non-magnesium alkali earth metal and magnesium in the surface portion of the second region of the heated interlayer film is larger than a total content of alkali metal, non-magnesium alkali earth metal and magnesium in the surface portion of the first region of the heated interlayer film by 3 ppm or more and 70 ppm or less.