There is provided an interlayer film for laminated glass which is high in moisture resistance and has a moderate adhesive force. In the interlayer film for laminated glass according to the present invention, when a process composed of sputtering and measurement by TOF-SIMS is performed n times, n Rations of Ion Intensity of Magnesium/Ion Intensity of Thermoplastic Resin obtained from the first to n-th sputtering and measurement processes are collected to calculate an average value 1 ≤ n ≤ 10 of 10 values of Ratio 1 ≤ n ≤ 10 measured within a range of 1 ≤ n ≤ 10, an average value 11 ≤ n ≤ 20 of 10 values of Ratio 11 ≤ n ≤ 20 measured within a range of 11 ≤ n ≤ 20, an average value 21 ≤ n ≤ 30 of 10 values of Ratio 21 ≤ n ≤ 30 measured within a range of 21 ≤ n ≤ 30, an average value 31 ≤ n ≤ 40 of 10 values of Ratio 31 ≤ n ≤ 40 measured within a range of 31 ≤ n ≤ 40, and an average value 41 ≤ n ≤ 50 of 10 values of Ratio 41 ≤ n ≤ 50 measured within a range of 41 ≤ n ≤ 50, among these five average values, the average value indicating the smallest value is the average value 1 ≤ n ≤ 10 or the average value 11 ≤ n ≤ 20 and the average value indicating the largest value is the average value 21 ≤ n ≤ 30 , the average value 31 ≤ n ≤ 40 , or the average value 41 ≤ n ≤ 50 .