The present invention provides the prepreg being formed by impregnating a fiber base material with a resin composition and the resin composition comprising an acrylic resin, wherein the ratio of the peak height near 2240 cm−1 due to nitrile groups (PCN) with respect to the peak height near 1730 cm−1 due to carbonyl groups (PCO) in the IR spectrum of the cured resin composition (PCN/PCO) is no greater than 0.001 and the like in order to provide a prepreg, a film with a resin, a metal foil with a resin and a metal-clad laminate, which exhibit excellent bending resistance while also prevent ion migration and have excellent insulating reliability when printed wiring boards are fabricated, as well as a printed wiring board employing the same.