Patent ID: 8454641

Claim:
A lancet device comprising: a lancet including a puncture needle mounted to a tip thereof, the lancet being configured to perform a puncture by moving the puncture needle forward in a puncture direction along a longitudinal axis of the lancet device; a lancet holder including a mounting portion that deforms inwardly toward the lancet for removably retaining a base end portion of the lancet inserted thereinto; and a fastening member configured to make contact with an outer peripheral surface of the mounting potion of the lancet holder for causing the mounting portion of the lancet holder to deform inwardly for retaining the lancet with a frictional force acting in a direction transverse to the longitudinal axis, the frictional force increasing for causing the lancet holder to tightly retain the lancet when the fastening member is moved relative to the lancet holder in a first direction along the longitudinal axis, the frictional force being reduced or removed for causing the lancet holder to release the lancet when the fastening member is moved relative to the lancet holder in a second direction opposite to the first direction along the longitudinal axis.