Provided is a tape prepreg formed by impregnating, with resin, a reinforcement fiber bundle in which reinforcement fibers are aligned in one direction, wherein: a cross-section perpendicular to the alignment direction of the reinforcement fiber bundle includes a region where the thickness continuously increases from one end and the other end in the width direction towards the center in the width direction; and any one boundary line in the thickness direction of such perpendicular cross-section and a boundary line in the width direction thereof are configured so that all of the angles formed by such boundary lines are acute angles.
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