An electronic blood pressure monitor includes an activation controller for exerting control in response to a signal representative of an instruction received from a user to selectively activate a plurality of functions included in first and second function groups of the electronic blood pressure monitor. The first function group includes a measurement function provided by a blood pressure measurement unit and the second function group includes an information changing function associated with erasing a measured value or changing a set value. The activation controller includes a determining unit for determining whether the electronic blood pressure monitor is started by a specific function, and a setting unit driven by a decision made by the determining unit to set the second function group in an activatable state or an inactivatable state.