NOVELTY - A thermal transfer film (10) is manufactured by forming uncured resin layer by applying ionizing radiation-curable resin composition containing ionizing radiation-curable resin, non-reactive silicone, and damage-proof filler on base film (11) which is polyester resin film or stretched polyolefin resin film with thickness of less than or equal to 50 mu m, irradiating ionizing radiation to uncured resin layer with exposure (B) of 5-10 Mrad, curing uncured resin layer, and forming surface protective layer (12), and successively laminating primer layer (13) and contact bonding layer (14) on surface protective layer.    USE - Manufacture of thermal transfer film for exterior cladding material and interior material of building structure and motor vehicle, solar cell cover or solar cell substrate, and component of domestic electrical appliances and electronic devices.    ADVANTAGE - Thermal transfer film with excellent processability can be stably manufactured. Surface protective layer of thermal transfer film has excellent weather resistance, transparency, and hard coating property.    DETAILED DESCRIPTION - A thermal transfer film (10) is manufactured by forming uncured resin layer by applying ionizing radiation-curable resin composition containing ionizing radiation-curable resin, non-reactive silicone, and damage-proof filler on base film (11) which is polyester resin film or stretched polyolefin resin film with thickness of less than or equal to 50 mu m, irradiating ionizing radiation to uncured resin layer with exposure (B) of 5-10 Mrad, curing uncured resin layer, and forming surface protective layer (12), and successively laminating primer layer (13) and contact bonding layer (14) on surface protective layer. Amount of filler is 0.1-8 mass parts with respect to 100 mass parts of ionizing radiation-curable resin. Value of (F) is calculated by formula F= greater than or equal to - 3/2x B+12, where F is amount of filler and B is exposure of ionizing radiation. An INDEPENDENT CLAIM is included for thermal transfer film (10) comprising base film (11), surface protective layer (12), primer layer (13), and contact bonding layer (14) in order.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the thermal transfer film.    Thermal transfer film (10)    Base film (11)    Surface protective layer (12)    Primer layer (13)    Contact bonding layer (14)