Restraining of power consumption and reduction in load are to be achieved by causing a pulse wave sensor to a minimum necessary extent and not performing unnecessary processing, in response to each user measuring the heart rate for various purposes.A biological information measuring device 1 includes: a pulse wave sensor unit 160 which detects a pulse wave of a living body and outputs a pulse wave signal an MCU 136 which generates heart rate information and time information a storage unit 159 capable of storing the heart rate information operation buttons 151 to 154 which output an operation signal corresponding to an input operation by a person and a display unit 120. The MCU 136 displays the time information on the display unit 120 in a time display mode, writes the heart rate information in the storage unit 159 in a measuring mode, and displays the heart rate information on the display unit 120 without writing the heart rate information in the storage unit 159 in a heartbeat display mode. The MCU 136 starts processing to shift the biological information measuring device from the time display mode to the heartbeat display mode if the operation signal indicates a predetermined operation.
