A prepreg roll comprising a continuous prepreg that is wound plural turns into a roll shape to form a multilayer roll, wherein the prepregs that constitute adjacent layers in the prepreg roll are in contact with each other, wherein the prepreg comprises reinforcing fibers and a matrix resin composition, characterized in that the matrix resin composition comprises: component: an epoxy resin, component: a radical polymerizable unsaturated compound, and component: a polymer formed by radical polymerization of the component, component: an epoxy resin curing agent, and component: a polymerization initiator that generates a radical, the prepreg is in a sheet form or a tape form, and in at least one surface of the prepreg, the tack value measured at a pressing pressure of 40 kPa is 70 kPa or less, while the tack value measured at a pressing pressure of 80 kPa is 150 kPa or more, the component is a photopolymerization initiator that causes a radical when irradiated with ultraviolet radiation or visible light, the component is localized at the surface layer portion of the prepreg, and the tack value is measured under the following conditions: Apparatus: Tack tester (manufactured by UBM plc, product name "TA-500") Temperature: 25 ± 3°C Humidity: 50 ± 10%RH Probe diameter: 8 mm or 20 mm (the tack value was measured with a probe diameter of 20 mm, and when the results thus obtained were 93.7 kPa or less, the measured value was employed as the tack value, and when the results thus obtained were more than 93.7 kPa, the results obtained by making measurement with a probe diameter of 8 mm were employed as the tack value) Pressing time: 30 seconds Speed of probe movement: 0.2 mm/s. component: an epoxy resin, component: a radical polymerizable unsaturated compound, and component: a polymer formed by radical polymerization of the component, component: an epoxy resin curing agent, and component: a polymerization initiator that generates a radical, the prepreg is in a sheet form or a tape form, and in at least one surface of the prepreg, the tack value measured at a pressing pressure of 40 kPa is 70 kPa or less, while the tack value measured at a pressing pressure of 80 kPa is 150 kPa or more, the component is a photopolymerization initiator that causes a radical when irradiated with ultraviolet radiation or visible light, the component is localized at the surface layer portion of the prepreg, and the tack value is measured under the following conditions: Apparatus: Tack tester (manufactured by UBM plc, product name "TA-500") Temperature: 25 ± 3°C Humidity: 50 ± 10%RH Probe diameter: 8 mm or 20 mm (the tack value was measured with a probe diameter of 20 mm, and when the results thus obtained were 93.7 kPa or less, the measured value was employed as the tack value, and when the results thus obtained were more than 93.7 kPa, the results obtained by making measurement with a probe diameter of 8 mm were employed as the tack value) Pressing time: 30 seconds Speed of probe movement: 0.2 mm/s. Apparatus: Tack tester (manufactured by UBM plc, product name "TA-500") Temperature: 25 ± 3°C Humidity: 50 ± 10%RH Probe diameter: 8 mm or 20 mm (the tack value was measured with a probe diameter of 20 mm, and when the results thus obtained were 93.7 kPa or less, the measured value was employed as the tack value, and when the results thus obtained were more than 93.7 kPa, the results obtained by making measurement with a probe diameter of 8 mm were employed as the tack value) Pressing time: 30 seconds Speed of probe movement: 0.2 mm/s.