Abstract: The present disclosure relates to a continuous glucose monitoring apparatus, and provides a continuous glucose monitoring apparatus of which a body-attachment unit starts operating, in a state in which the body-attachment unit is inside an applicator, by the supply of power to the body-attachment unit through a user operation, such as separation and removal of a protective cap, so that the operating start time point of the body-attachment unit is formed by means of the user operation immediately before the body-attachment unit is inserted into and attached to the human body, thereby enabling the body-attachment unit to start operating at an appropriate point in time, the body-attachment unit starts operating only by simply removing the protective cap even without performing separate additional work for starting operation of the body-attachment unit, thereby improving use convenience, and an operating method for a power supply switch means that supplies battery power to the body-attachment unit is formed as va