An interlayer film for laminated glass of the present invention comprises a thermoplastic resin, a carboxylic acid, and an alkali (alkaline earth) metal, wherein, when a molar concentration per unit volume of the alkali (alkaline earth) metal in the interlayer film for laminated glass, measured by ICP atomic emission spectrophotometry is A (mol/m 3 ); a molar concentration per unit volume of the carboxylic acid in the interlayer film for laminated glass, measured by GC-MS is B (mol/m 3 ); a molar concentration per unit volume of the carboxylic acid in the interlayer film for laminated glass, measured by GC-MS after a hydrochloric acid aqueous solution is added to the interlayer film for laminated glass to be left at 23°C for 12 hours is Y; and a molar concentration per unit volume of the carboxylic acid, obtained by subtracting the molar concentration B from the concentration Y is D (mol/m 3 ), the molar concentration A is more than 0.35 mol/m 3 and less than 1.00 mol/m 3 , and a carboxylic acid isolation ratio (1) represented by (1 - D/A) × 100 is 40% or less.