Provided is an instrument capable of promoting muscle stretching and increasing a range of motion of a joint. The instrument according to the present invention includes: a main body portion; a pressing portion that is provided to protrude from the main body portion, and a vibration applying unit that generates vibration, in which by grasping the main body portion with one hand, the pressing portion is configured to be brought into contact with skin on a Pacinian corpuscle present in the palm to press the Pacinian corpuscle while transmitting vibration to the Pacinian corpuscle, and the pressing portion can accurately be brought into contact with the Pacinian corpuscle to apply an appropriate pressure to the Pacinian corpuscle.