BAND SAW BLADE

To provide a band saw blade capable of satisfactorily cutting a hard brittle material even when using a water-soluble cutting oil.SOLUTION: A band saw blade (91) has an abrasive grain part (3) containing a plurality of diamond or CBN abrasive grains and is capable of cutting a hard brittle material. With an aspect ratio being a value obtained by dividing the length of a short axis by the length of a long axis in a projection shape of the abrasive grain and with a predetermined division value (Asb) for dividing the aspect ratio being 0.8, when distinguishing between a first abrasive grain (131) in which some of the first crystallites form a lump of the plurality of abrasive grains to have a shape with a first aspect ratio (As1) greater than the division value (Asb) and a second abrasive grain (31) in which some of the second crystallites having a crystallite size smaller than that of the first crystallites form a lump to have a shape with a second aspect ratio (As2) smaller than the division value (Asb), a content ratio of the second abrasive grains (31) is 70% or more and 100% or less.SELECTED DRAWING: Figure 2 【課題】水溶性切削油を用いても硬質脆性材を良好に切削加工できる帯鋸刃を提供する。【解決手段】帯鋸刃（９１）は、ダイヤモンド又はＣＢＮの複数の砥粒を含む砥粒部（３）を有して硬質脆性材料の切削が可能である。砥粒の投影形状において短軸の長さを長軸の長さで除した値をアスペクト比として前記アスペクト比を区分する所定の区分値（Ａｓｂ）を０．８とし、前記複数の砥粒を、第1結晶子の幾つかが塊となって前記区分値（Ａｓｂ）よりも大きい第１のアスペクト比（Ａｓ１）の形状を有する第１砥粒（１３１）と、前記第１結晶子よりも結晶子サイズが小さい第２結晶子の幾つかが塊となって前記区分値（Ａｓｂ）よりも小さい第２のアスペクト比（Ａｓ２）の形状を有する第２砥粒（３１）とに区別したときに、第２砥粒（３１）の含有数量比率が７０％以上、１００％以下である。【選択図】図２