Patent ID: 8920331

Claim:
A pulse wave measuring device comprising: a main unit; and an external sensor detachably connected to the main unit and that includes: an external light-emitting module emitting light to a human body to be measured, and an external light-receiving module receiving at least one of reflected light and transmitted light originating from the external light-emitting module and the human body to thereby perform a measurement of a pulse wave; wherein the main unit includes: a connector to which the external sensor is connectable; a first controller that controls the external light-emitting module through a connection between the external sensor and the connector; a second controller that controls the external light-receiving module through the connection between the external sensor and the connector; and an external sensor connection determination section that determines whether the connection between the external sensor and the connector is established based on a transient response of the external light-receiving module upon an activation of the external light-emitting module and the external light-receiving module, wherein the measurement of the pulse wave by using the external sensor is started after the external sensor connection determination section determines that the connection between the external sensor and the connector is established, wherein the main unit further includes: an internal sensor that includes: an internal light-emitting module emitting light to a human body be measured, and an internal light-receiving module receiving at least one of reflected light and transmitted light originating from the internal light-emitting module to thereby perform the measurement of the pulse wave independently from the external sensor; a third controller that controls the internal light-emitting module; and a fourth controller that controls the internal light-receiving module, wherein the measurement of the pulse wave by using the internal sensor is started after the external sensor connection determination section determines that the connection between the external sensor and the connector is not established.