A sheet set for encapsulating a solar battery comprising: a first encapsulating sheet and a second encapsulating sheet which are disposed between a light-incident surface protective member and a back surface protective member, and are used to encapsulate solar battery elements, wherein, when the first encapsulating sheet and the second encapsulating sheet are subjected to a heating and pressurization treatment in which the first encapsulating sheet and the second encapsulating sheet are heated and depressurized at 150°C and 250 Pa for three minutes, and then are heated and pressurized at 150°C and 100 kPa for 15 minutes, a volume resistivity of the first encapsulating sheet, which is based on JIS K6911 and is measured at a temperature of 100° C with an applied voltage of 500 V, is higher than a volume resistivity of the second encapsulating sheet, the volume resistivity of the heated and pressurized first encapsulating sheet is in a range of 1×10 13 Ω · cm to 1×10 18 Ω · cm, the volume resistivity of the heated and pressurized second encapsulating sheet is in a range of 1×10 8 Ω · cm to 1×10 16 Ω · cm, the first encapsulating sheet is disposed between the light-incident surface protective member and the solar battery elements, and the second encapsulating sheet has at least one polar group selected from a carboxyl group, an ester group, a hydroxyl group, an amino group, and an acetal group, at least one of the first encapsulating sheet and the second encapsulating sheet contains an ethylene-based copolymer as a crosslinkable resin, and the ethylene-based copolymer is a resin selected from a group consisting of an ethylene/α-olefin copolymer and an ethylene/polar monomer copolymer, and at least one of the first encapsulating sheet and the second encapsulating sheet contains an ethylene/α-olefin copolymer as the crosslinkable resin, and the ethylene/α-olefin copolymer satisfies the following a1) to a4), a1) a content ratio of a structural unit derived from ethylene is in a range of 80 mol% to 90 mol%, and a content ratio of a structural unit derived from an α-olefin having 3 to 20 carbon atoms is in a range of 10 mol% to 20 mol%; a2) MFR, which is based on ASTM D1238 and is measured under conditions of a temperature of 190°C and a load of 2.16 kg, is in a range of 0.1 g/10 minutes to 50 g/10 minutes; a3) a density, which is measured on the basis of ASTM D1505, is in a range of 0.865 g/cm 3 to 0.884 g/cm 3; and a4) a shore A hardness, which is measured on the basis of ASTM D2240, is in a range of 60 to 85. a first encapsulating sheet and a second encapsulating sheet which are disposed between a light-incident surface protective member and a back surface protective member, and are used to encapsulate solar battery elements, wherein, when the first encapsulating sheet and the second encapsulating sheet are subjected to a heating and pressurization treatment in which the first encapsulating sheet and the second encapsulating sheet are heated and depressurized at 150°C and 250 Pa for three minutes, and then are heated and pressurized at 150°C and 100 kPa for 15 minutes, a volume resistivity of the first encapsulating sheet, which is based on JIS K6911 and is measured at a temperature of 100° C with an applied voltage of 500 V, is higher than a volume resistivity of the second encapsulating sheet, the volume resistivity of the heated and pressurized first encapsulating sheet is in a range of 1×10 13 Ω · cm to 1×10 18 Ω · cm, the volume resistivity of the heated and pressurized second encapsulating sheet is in a range of 1×10 8 Ω · cm to 1×10 16 Ω · cm, the first encapsulating sheet is disposed between the light-incident surface protective member and the solar battery elements, and the second encapsulating sheet has at least one polar group selected from a carboxyl group, an ester group, a hydroxyl group, an amino group, and an acetal group, at least one of the first encapsulating sheet and the second encapsulating sheet contains an ethylene-based copolymer as a crosslinkable resin, and the ethylene-based copolymer is a resin selected from a group consisting of an ethylene/α-olefin copolymer and an ethylene/polar monomer copolymer, and at least one of the first encapsulating sheet and the second encapsulating sheet contains an ethylene/α-olefin copolymer as the crosslinkable resin, and the ethylene/α-olefin copolymer satisfies the following a1) to a4), a1) a content ratio of a structural unit derived from ethylene is in a range of 80 mol% to 90 mol%, and a content ratio of a structural unit derived from an α-olefin having 3 to 20 carbon atoms is in a range of 10 mol% to 20 mol%; a2) MFR, which is based on ASTM D1238 and is measured under conditions of a temperature of 190°C and a load of 2.16 kg, is in a range of 0.1 g/10 minutes to 50 g/10 minutes; a3) a density, which is measured on the basis of ASTM D1505, is in a range of 0.865 g/cm 3 to 0.884 g/cm 3; and a4) a shore A hardness, which is measured on the basis of ASTM D2240, is in a range of 60 to 85. a1) a content ratio of a structural unit derived from ethylene is in a range of 80 mol% to 90 mol%, and a content ratio of a structural unit derived from an α-olefin having 3 to 20 carbon atoms is in a range of 10 mol% to 20 mol%; a2) MFR, which is based on ASTM D1238 and is measured under conditions of a temperature of 190°C and a load of 2.16 kg, is in a range of 0.1 g/10 minutes to 50 g/10 minutes; a3) a density, which is measured on the basis of ASTM D1505, is in a range of 0.865 g/cm 3 to 0.884 g/cm 3; and a4) a shore A hardness, which is measured on the basis of ASTM D2240, is in a range of 60 to 85.