An interlayer film for laminated glass, wherein the interlayer film has a structure of two or more layers, and wherein the said interlayer film has a first layer containing a polyvinyl acetal resin and a plasticizer and a second layer containing a polyvinyl acetal resin and a plasticizer, and the first layer is arranged on a first surface side of the second layer; and wherein the said interlayer film has either constitution or constitution, as described below: constitution: the half-value width of the hydroxyl group of the polyvinyl acetal resin contained in the first layer being less than or equal to 250 cm -1 and the content of the plasticizer contained in the first layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the first layer being greater than or equal to 5 parts by weight and less than 30 parts by weight, constitution: the half-value width of the hydroxyl group of the polyvinyl acetal resin contained in the first layer being greater than 250 cm -1, wherein, in the case of constitution, the interlayer film has a structure of three or more layers, the interlayer film has the first layer, the second layer and a third layer containing a polyvinyl acetal resin and a plasticizer, and, the third layer is arranged on a second surface side opposite to the first surface side of the second layer, and wherein, in the case of constitution, the content of the plasticizer contained in the second layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the second layer is larger than the content of the plasticizer contained in the first layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the first layer, and the content of the plasticizer contained in the second layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the second layer is larger than the content of the plasticizer contained in the third layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the third layer. and wherein the said interlayer film has either constitution or constitution, as described below: constitution: the half-value width of the hydroxyl group of the polyvinyl acetal resin contained in the first layer being less than or equal to 250 cm -1 and the content of the plasticizer contained in the first layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the first layer being greater than or equal to 5 parts by weight and less than 30 parts by weight, constitution: the half-value width of the hydroxyl group of the polyvinyl acetal resin contained in the first layer being greater than 250 cm -1, wherein, in the case of constitution, the interlayer film has a structure of three or more layers, the interlayer film has the first layer, the second layer and a third layer containing a polyvinyl acetal resin and a plasticizer, and, the third layer is arranged on a second surface side opposite to the first surface side of the second layer, and wherein, in the case of constitution, the content of the plasticizer contained in the second layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the second layer is larger than the content of the plasticizer contained in the first layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the first layer, and the content of the plasticizer contained in the second layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the second layer is larger than the content of the plasticizer contained in the third layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the third layer.