A heat radiation reflective film comprising: at least one heat radiation reflective unit on one surface of a support, the unit is characterized by comprising: at least 6 laminated layers, each layer having a different refractive index from an adjacent layer, consisting of the high refractive index layers and the low refractive index layers laminated alternately, wherein the high refractive index layers comprise first metal oxide particles and water-soluble polymer and the low refractive index layers comprise second metal oxide particles different from the first metal oxide particles and water-soluble polymer, characterized in that a first unit as one of the heat radiation reflective units comprises the layer closest to the support among the high refractive index layers and the low refractive index layers having a thickness which is 3 times or more of the thickness of the layer of the unit farthest from the support among the high refractive index layers and the low refractive index layers, and the layer closest to the support has a thickness of 400 to 800 nm, wherein the layers which constitute the first unit adjoin each other via a blended region having a thickness 0.4-0.8 time of the thickness of the layer farthest from the support, whereby the blended region (3/6) corresponds to a region at the interface between two adjacent layers in which the refractive index varies continually. at least one heat radiation reflective unit on one surface of a support, the unit is characterized by comprising: at least 6 laminated layers, each layer having a different refractive index from an adjacent layer, consisting of the high refractive index layers and the low refractive index layers laminated alternately, wherein the high refractive index layers comprise first metal oxide particles and water-soluble polymer and the low refractive index layers comprise second metal oxide particles different from the first metal oxide particles and water-soluble polymer, characterized in that a first unit as one of the heat radiation reflective units comprises the layer closest to the support among the high refractive index layers and the low refractive index layers having a thickness which is 3 times or more of the thickness of the layer of the unit farthest from the support among the high refractive index layers and the low refractive index layers, and the layer closest to the support has a thickness of 400 to 800 nm, wherein the layers which constitute the first unit adjoin each other via a blended region having a thickness 0.4-0.8 time of the thickness of the layer farthest from the support, whereby the blended region (3/6) corresponds to a region at the interface between two adjacent layers in which the refractive index varies continually. at least 6 laminated layers, each layer having a different refractive index from an adjacent layer, consisting of the high refractive index layers and the low refractive index layers laminated alternately, wherein the high refractive index layers comprise first metal oxide particles and water-soluble polymer and the low refractive index layers comprise second metal oxide particles different from the first metal oxide particles and water-soluble polymer, characterized in that a first unit as one of the heat radiation reflective units comprises the layer closest to the support among the high refractive index layers and the low refractive index layers having a thickness which is 3 times or more of the thickness of the layer of the unit farthest from the support among the high refractive index layers and the low refractive index layers, and the layer closest to the support has a thickness of 400 to 800 nm, wherein the layers which constitute the first unit adjoin each other via a blended region having a thickness 0.4-0.8 time of the thickness of the layer farthest from the support, whereby the blended region (3/6) corresponds to a region at the interface between two adjacent layers in which the refractive index varies continually.