A biometric information processing device includes a main case that is designed to be worn on a body of a user. The main case includes a battery unit that provides power to a pulse sensor, a processing unit that determines a biometric information of the user based on information from the pulse sensor, a display unit that displays at least one of the biometric information and a calorie expenditure information spent by the user, and a rotation stop unit that is formed in unison with the main case and is disposed at a 6 oclock side of the main case, and has an electrical circuit to send an electrical signal to the processing unit.
