Medium cutting method, medium cutting device, medium end connection method, and control method for medium cutting device

The present invention stabilizes the shape of a cut-off section without being affected by the characteristics of a medium. The medium cutting method includes: a first piercing step in which a blade pierces a medium (2) so as to penetrate the medium (2); and a first cutting step for cutting the medium (2) in a direction inclined to the width direction of the medium (2) by moving the cutter relative to the medium (2) in the longitudinal direction of the medium (2) and in the width direction of the medium (2), starting from a first piercing site (SP2), which is a site pierced by the cutter in the first piercing step. 使切断部的形状稳定，而不受介质的特性的影响。该介质切断方法包括：第1刺穿工序，在该第1刺穿工序中，以贯穿介质(2)的方式将刀具刺穿于介质(2)；以及第1切割工序，在该第1切割工序中，以在第1刺穿工序中被刀具刺穿了的部位即第1刺穿部位(SP2)为起点，使刀具相对于介质(2)在介质(2)的长度方向和介质(2)的宽度方向上相对地移动，而在相对于介质(2)的宽度方向倾斜的方向上切割介质(2)。