To provide a broaching tool and a broaching method of broaching which finish a hollow hole formed in a highly hard material having hardness of 45-65 HRC, and perform broaching, even in a case of using a cutting blade formed from a carbide alloy, with less generation of chipping and abnormal abrasion in blade tip and with a long service life.

In this broaching tool for finishing a hollow hole with multiple cutting blades 2 arranged in order of dimension in the longitudinal direction thereof, at least a finishing part of the cutting blade 2 is formed from a carbide alloy, and depth of cut-in per one blade of the cutting blades 2 is set at 5-15 μm in a cutting direction in case of a groove hole such as a spline hole or a ball groove, and at 3 μm - less than 9 μm in case of a round broach hole.