NOVELTY - A resin film (15) consists of a resin composition containing fluororesin (A), particles (B) containing titanium oxide as a main component, a phosphorus compound (C) and a silicone oil (D). The compound (C) is phosphonite compound (C1) (I) having molecular weight of 600-1500, phosphonate compound (C2) (II) having molecular weight of 400-1500 and/or phosphate compound (C3) (III) having molecular weight of 400-1500. The content of phosphorus compound (C) and silicone oil (D) is 0.20-2 parts mass and 0.2-2.5 parts mass, respectively with respect to 100 parts mass particles (B).    USE - Resin film is used as back sheet for solar cell module (all claimed).    ADVANTAGE - The resin film has excellent ultraviolet-ray shielding property, external appearance, weather resistance, optical characteristics and mechanical property.    DETAILED DESCRIPTION - A resin film consists of a resin composition containing fluororesin (A), particles (B) containing titanium oxide as a main component, a phosphorus compound (C) and a silicone oil (D). The compound (C) is phosphonite compound (C1) of formula (I) having molecular weight of 600-1500, phosphonate compound (C2) of formula (II) having molecular weight of 400-1500 and/or phosphate compound (C3) of formula (III) having molecular weight of 400-1500. The content of phosphorus compound (C) and silicone oil (D) is 0.20-2 parts mass and 0.2-2.5 parts mass, respectively with respect to 100 parts mass particles (B).    R11-R14,R21-R24,R31-R34=aryl optionally having alkyl, or alkyl;and    R15,R25,R35=bivalent hydrocarbyl.    INDEPENDENT CLAIMS are included for the following:    (1) back sheet (2) of solar cell module, which has the resin film; and    (2) solar cell module, which is provided with the back sheet.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of the back sheet of solar cell module.    Back sheet (2)    Outermost layer (11)    Adhesive bond layer (12)    Adhesive layer (14)    Resin film (15)