具有优异的附着力和碳纤维的长期储存稳定性和基体树脂，以提供预浸料和碳纤维增强优异的由微裂纹的增韧性复合材料。 本发明是一种脂肪族环氧化合物（A）和涂覆有上浆剂的芳香族环氧化合物上浆剂涂覆的碳纤维，其包含（B1）的织物或编织物，热固性树脂（D）的形式，所述热塑性树脂 （F）和潜在性固化剂（G）通过浸渍含有施胶剂的表面施加碳纤维的热固化性树脂组合物形成的预浸料坯，所述的C1s通过X射线光电子能谱法测定 壳光谱（a）中的CHx，C-C，结合能归因于C = C，归因于（b）中C-O的结合能的部件的高度的部件的高度的比率（A）/ （b）中其特征在于，它是在预定的范围。

Excellent in adhesion and long-term storage stability of the carbon fiber and the matrix resin, to provide a prepreg and carbon-fiber reinforced composite material excellent in microcrack resistance by a high toughness. The present invention is an aliphatic epoxy compound (A) and the aromatic epoxy compound sizing agent applying carbon fibers coated with a sizing agent containing (B1) the form of a fabric or braid, a thermosetting resin (D), the thermoplastic resin (F) and a latent curing agent (G) prepreg formed by impregnating a thermosetting resin composition containing the surface of said sizing agent coating the carbon fibers, C _1s, as measured by X-ray photoelectron spectroscopy (a) CHx of the inner shell spectrum, C-C, the ratio of the height of the components of the binding energy attributed to C = C, and the height of the components of the binding energy attributed to the (b) C-O (a) / (b) it is characterized by a predetermined range.