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 value1≤n≤10 of 10 values of Ratio1≤n≤10 measured within a range of 1≤n≤10, an average value11≤n≤20 of 10 values of Ratio11≤n≤20 measured within a range of 11≤n≤20, an average value21≤n≤30 of 10 values of Ratio21≤n≤30 measured within a range of 21≤n≤30, an average value31≤n≤40 of 10 values of Ratio31≤n≤40 measured within a range of 31≤n≤40, and an average value41≤n≤50 of 10 values of Ratio41≤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 value1≤n≤10 or the average value11≤n≤20 and the average value indicating the largest value is the average value21≤n≤30, the average value31≤n≤40, or the average value41≤n≤50.