An interlayer film for a laminated glass includes a thermoplastic resin and a plasticizer. The ratio of a high molecular weight component with an absolute molecular weight of 1000000 or more in the thermoplastic resin is 7.4% or higher, or the ratio of a high molecular weight component with a polystyrene-equivalent molecular weight of 1000000 or more in the thermoplastic resin is 9% or higher. A first multilayer interlayer film for a laminated glass includes an interlayer film for a laminated glass and an interlayer film for a laminated glass that contains a thermoplastic resin and a plasticizer, and is laminated on one face of the interlayer film for a laminated glass.