Flat drill

The present invention relates to a flat drill. According to an embodiment of the present invention, a flat drill formed such that a cutting angle of a cutting edge and a relief angle of the cutting edge are different from each other on a side close to the center of the flat drill and a side far from the center. In addition, according to the embodiment of the present invention, the flat drill has an evenly formed chisel part formed at a boundary portion of a first cutting edge and a second cutting edge. 本发明涉及种扁钻。本发明的实施例的扁钻构成为切削刃的切入角和切削刃的后角在靠近扁钻的中心的侧和远离中心的侧互不相同。另外，就本发明的实施例的扁钻而言，形成于第切削刃和第二切削刃的边界部分的凿部平坦地形成。