It is an object to provide an intermediate base material that is excellent in the conformity to three-dimensional shapes and, when formed into a fiber reinforced plastic, develops good surface quality and high mechanical properties and a production method for the intermediate base material.;An incised prepreg that has, in at least a partial region in a prepreg that contains unidirectionally oriented reinforcing fibers and a resin, a plurality of incisions that divide reinforcing fibers, wherein, in the case where a population is made up of the numbers of incisions contained in ten small circular regions of 10 mm in diameter randomly selected in the aforementioned region, a mean value for the population is 10 or greater and a coefficient of variation therefor is within 20%;A cross-ply laminate of incised prepregs which satisfies the following tensile property indicated below in a specific environment.;(Tensile property) In the case where a fiber direction of one of the incised prepregs in the cross-ply laminate is 0°, load 1 × 0.5 load 2 load 1 × 1.5 where the load 1 is a load that occurs in the cross-ply laminate in a 0° direction when a tensile strain of 1% is applied to the cross-ply laminate in the 0° direction and the load 2 is a load that occurs in the cross-ply laminate in the 0° direction when a tensile strain of 2% is applied to the cross-ply laminate in the 0° direction.;A production method for an incised prepreg in which while tension is being given to a prepreg, the prepreg is passed through between a rotary blade roll whose total length of blades is within a range of 1 to 3000 m/m2 and a supporting roll proximate to and substantially parallel with the rotary blade roll in such a manner as to have end sides of the prepreg within a predetermined range in an axis direction of the rotary blade roll so that an incised prepreg is provided with at least one of the reinforcing fibers being divided in fiber length.
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