A lancing device (A) includes a lancing adjustment mechanism for adjusting the lancing depth of a lancet (L) into a target portion (99) by operating an operation member (20c). The lancing adjustment mechanism is designed to provide a nonlinear relationship between the lancing depth of the lancet (L) into the target portion (99) and the operation amount of the operation member (20c). With this arrangement, it is possible to suitably adjust bleeding at the lanced portion, thereby improving the operationality of the lancing device (A).
