Disclosed herein is a probe 1 for measuring a lip closing force, the probe including: a hollow balloon 10 configured to be disposed between an upper lip 50 and lower lip 51 of a subject, and crushed and deformed by the lip closing force, and a base 20 which is connected to a pressure measurement device 100 for measuring an internal pressure of the balloon 10. The balloon 10 is provided with a fixable portion 13 configured to be sandwiched between teeth 52 and 53 or gums of the subject.