To provide a carbon fiber containing sheet in which a thermal conductivity is improved by increasing a contact area of carbon fibers.SOLUTION: As carbon fibers such as waste material, PAN-based carbon fibers are collided with each other by air flow crushing to be crushed, a first fiber element 3 having a fiber length of 20 μm to 100 μm and a fiber diameter of 5 to 15 μm, and a second fiber element 4 having a fiber length of 20 μm or less and a fiber diameter of 200 nm are included. Then, it is contained in PVC so that 1 pt.wt. of the second fiber element is contained with respect to 20 to 30 pts.wt. of the first fiber element, and is rotationally agitated by a mixer 61 to orient each fiber element. Then, after equalizing with a mixing roll 62, a sheet is made with a calendar roll 63.SELECTED DRAWING: Figure 1【課題】炭素繊維の接触面積を大きくして、熱伝導性を向上させるようにした炭素繊維含有シートを提供することを目的とする。【解決手段】廃材などの炭素繊維としてＰＡＮ系の炭素繊維を気流粉砕で互いに衝突させて粉砕させ、繊維長が２０μｍ乃至１００μｍ、繊維径が５乃至１５μｍの第一繊維要素３と、繊維長が２０μｍ以下で繊維径が２００ｎｍの第二繊維要素４を含むようにする。そして、この第一繊維要素２０乃至３０重量部に対して第二繊維要素１重量部含むようにＰＶＣに含有させ、ミキサー６１で回転撹拌させ、各繊維要素を配向させる。そして、ミキシングロール６２で均等化させた後、カレンダーロール６３でシート状にしていく。【選択図】図１
